47 results on '"Akdeniz, Gülsüm"'
Search Results
2. The ratio of second and fourth finger lengths (2D:4D) can determine handedness
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AKDENİZ, Gülsüm, primary
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- 2023
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3. AĞIR RUH HASTALIĞI OLAN HASTALARDA COVİD-19 AŞILAMA ORANLARI
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KILIÇ, Osman Hasan Tahsin, primary, AKDENİZ, Gülsüm, additional, GÖKSU, Merziye Gökçe, additional, and MANOĞLU, Burcu Gülün, additional
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- 2023
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4. Face-like pareidolia images are more difficult to detect than real faces in children with autism spectrum disorder
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Akdeniz, Gülsüm, primary
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- 2023
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5. BLUE LIGHT AND PROTECTION AWARENESS AMONG UNIVERSITY STUDENTS: A SURVEY STUDY.
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Yeşilırmak, Nilüfer, Eid, Razan, Mahmudova, Günel, and Akdeniz, Gülsüm
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BLUE light ,COLLEGE students ,AWARENESS ,DIGITAL technology - Abstract
Objectives: Our study aimed to evaluate the awareness levels of university students about the harmful effects of blue light and protection methods. Materials and Methods: A cross-sectional survey study consisting of 20 questions was conducted online to university students in Ankara. After obtaining basic information about the participants, questions related to the hazardous effects of blue light, blue light sources, blue light filters and protectors were directed. Results: A total of 387 participants were included in the study. 75.1% of the students thought of vision problems as the most harmful effect of blue light and phones, computers and televisions as blue light sources (93.8%). 58.8% of the students were using the blue light filter, 67.6% knew about blue light protective glasses, and only 26.9% were wearing them. The average daily computer, smartphone and television usage time was 3.18 hours, 5.2 hours and 0.5 hours, respectively. 71.5% of the students were taking breaks when using electronic devices, while 28.5% were not. 56.2% of the students were experiencing tired eyes, 49.7% headaches, 31.9% blurred vision, 30.8% dry eyes and 30.3% insomnia. 95.1% of the students were adjusting their settings to reduce the brightness. Students in medical fields were more aware of blue light-related sleep problems and blue light protective glasses than students in other fields. Conclusion: Awareness of blue light was moderate among university students, however awareness of protective methods was lower. This study will contribute to increasing awareness on this issue in terms of protecting the health of young people, and subsequently general society. [ABSTRACT FROM AUTHOR]
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- 2024
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6. Face-like pareidolia images are more difficult to detect than real faces in children with autism spectrum disorder.
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Akdeniz, Gülsüm
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CHILDREN with autism spectrum disorders ,ASPERGER'S syndrome ,AUTISM spectrum disorders ,NEUROPSYCHOLOGICAL tests ,AUTISTIC children ,SPECIFIC language impairment in children ,AUTISM in children - Abstract
Background. Research on the diagnosis, treatment and pathophysiology of neurodevelopmental disorders is multifaceted, requiring the use of genetics, imaging, psychology, and artificial intelligence (AI). Autism spectrum disorder (ASD) is a neurodevelopmental disorder characterized by a limited ability to communicate and a limited interest in social environments. Facial recognition is really important in daily life. Seeing faces in unusual objects, e.g., a face in a cloud, is called face pareidolia. Objectives. Although more evidence points to a greater role of genetic factors in ASD, neuropsychological tests have an important role in diagnosing ASD. The aim of the study was to investigate how face perception is processed in children with autism using a new digital test that consists of faces and pareidolia images. Materials and methods. Twenty typically developing (TD) children (8 male, 12 female) between 6 and 16 years of age and 21 children with ASD (14 male, 7 female) between 6 and 14 years of age were included in the study. A new neuropsychological test called the digital pareidolia test was administered to the participants. The study consisted of 2 stages: a face condition and a pareidolia condition. Results. Our results showed that children with autism (n = 21) were less successful in identifying both face and pareidolia images, and were slower to react in both conditions than children from the TD group. Both children with ASD and the TD group reacted faster to face images than pareidolia images. Conclusions. The findings in this study are in agreement with atypical and different face perceptions in autism which cause social difficulties. We demonstrated that the digital face and pareidolia test has considerable potential for use as a neuropsychological test that can specify the diagnosis and progression of autism in subclinical areas. Pareidolia faces and real faces are processed in a common way. [ABSTRACT FROM AUTHOR]
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- 2024
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7. Examining the relationship between touch and visual perception: pareidolia perception in the social brain.
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Akdeniz, Gülsüm, Deliktaş, Özgen Deniz, Fincan, Ayşe Ceren, Yılmaz, Gülsen, Yoldaş, Tahir Kurtuluş, and Özışık, Pınar
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VISUAL perception ,BRAIN ,ANALYSIS of variance ,LARGE-scale brain networks ,STATISTICAL correlation - Abstract
Copyright of Pamukkale Medical Journal is the property of Pamukkale Journal of Medicine and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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- 2024
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8. Higher Perceived Stress Increases the Subjective Reporting of ADHD: A Sample of Medical Students.
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Akçay, Elif, Akdeniz, Gülsüm, Özışık, Pınar, and Yılmaz, Gülsen
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This study aimed to evaluate the subjective Attention-Deficit/Hyperactivity Disorder (ADHD) symptoms with self-reported ratings and objective neurocognitive tests among medical students. Also, we examined the psychological factors associated with ADHD reporting among medical students. Medical students (N=57) completed self-report questionnaires, and neurocognitive tests were conducted for attention measures. Participants had a mean age of 20.3 years, and 69.0% were female. Subjective reporting of ADHD by students was associated with high levels of perceived stress, anxiety, and childhood and current ADHD symptoms. However, according to the results of multivariate regression analysis, only the perceived stress level was an affecting factor in reporting ADHD in medical school students [odds ratio [OR] =1.184, 95% confidence interval [CI] = [1.015; 1.381]]. The higher the perceived stress levels, the more likely medical students were to report having ADHD. Objective attention measures had no impact on reporting ADHD subjectively. Screening for perceived stress is necessary for medical students, especially those with subjective ADHD symptoms. [ABSTRACT FROM AUTHOR]
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- 2023
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9. KİŞİLİK ÖZELLİKLERİNİN YEŞİL ÖRGÜTSEL DAVRANIŞ ÜZERİNE ETKİSİ
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ERBAŞI, Ali, primary, ÇALIŞKAN, Abdullah, additional, and AKDENİZ, Gülsüm, additional
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- 2022
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10. The Assessment of Effect of Occupational Manganese Exposure on Cognition and Quantitative EEG Variables
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AKTÜRK, Tülin, ÇELİKER, Gülay, ŞAHAN, Mehmet Hamdi, AKDENİZ, Gülsüm, TUTKUN, Engin, and ALGIN, Oktay
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Pallidal index,quantitative EEG,welder,manganese ,Health Care Sciences and Services ,Sağlık Bilimleri ve Hizmetleri ,Pallidal indeks,kantitatif EEG,kaynakçı,manganez - Abstract
Mesleki Manganez (Mn) maruziyeti ekstrapiramidal sistem bulgularına ve bilişsel etkilenmeye neden olur. Mesleki Mn maruziyetinin kognisyon ve kantitatif EEG (qEEG) verileri üzerindeki etkisini değerlendirmeyi amaçladık. Bu çalışmaya mesleki Mn maruziyeti olan 175 erkek işçi dahil edildi. Beyin manyetik rezonans görüntüleme (MRI) T1 sekansında pallidal indeks (PI) değeri hesaplandı. Beyin MRI’da T1 hiperintensitesinin varlığı çift kör iki nörolog tarafından değerlendirildi. Kan, spot idrar ve 24 saatlik idrar manganez seviyeleri kaydedildi. MoCA testi toplam puanları ile yürütücü işlevler, dikkat, bellek gibi alt grupların puanları belirlendi. Kantitatif EEG (qEEG) verileri analiz edildi. Manganez maruziyeti olanların sağ ve sol PI değeri, kontrol grubuna göre istatistiksel olarak anlamlı derecede yüksek saptandı (p0.05). T1 hiperintensitesi saptananlarda MoCA toplam puanı, soyut düşünme ve tekrarlama puanının düşük olduğu saptandı. Mn maruziyeti olanlarda MRG’ de T1 hiperintesitesinin klinisyen tarafından farkedilmesi ile bilişsel fonksiyonların etkilendiği ve bu etkilenmenin öncelikle tekrarlama ve soyut düşünmede olduğu saptanmıştır. Bu parametreler, iş yeri hekimlerince, kaynakçıların periyodik muayenelerinde kognisyonun değerlendirilmesi için tarama testi olarak kullanılabilir., Occupational Mn exposure results in extrapyramidal system findings and cognitive impairment. We aimed to evaluate the effect of occupational exposure to Mn on cognition and quantitative EEG (qEEG) data in Mn exposed workers. One hundred seventy-five workers with occupational Mn exposure were included in this study. Pallidal index (PI) values were calculated in T1 weighted sequence of brain magnetic resonance imaging (MRI).The presence of T1 hyperintensity on MRI was evaluated by two independent neurologists. The serum, spot urine, and 24-hour urine samples were measuredMn levels. The total scores of MoCA test and sub-groups were determined. The qEEG measures were analyzed. Right/left PI values in manganese exposed group were statistically higher than in control group (p
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- 2021
11. KİŞİLİK ÖZELLİKLERİNİN YEŞİL ÖRGÜTSEL DAVRANIŞ ÜZERİNE ETKİSİ
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ERBAŞI, Ali, ÇALIŞKAN, Abdullah, and AKDENİZ, Gülsüm
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İşletme ,Green organizational behavior ,personality traits ,organizational behavior ,green behavior ,YEŞİL ÖRGÜTSEL DAVRANIŞ ,KİŞİLİK ÖZELLİKLERİ ,ÖRGÜTSEL DAVRANIŞ ,YEŞİL DAVRANIŞ ,Management - Abstract
In this study, it is aimed to examine the effect of employee personality traits on green organizational behavior. In this context, green employees who have personality traits showed more green organizational behavior was tried to determine. The data obtained, it was determined that the participants have moderate green organizational behavior and have moderate behavior in all sub-dimensions of green organizational behavior. In addition, it was determined that the participants have moderate ability to openness to experience; have high level agreeableness, conscientiousness, extraversion characteristics; and have moderate-high level of emotional stability. Regression findings from the study revealed that personality traits have a positive and statistically significant effect on the green organizational behavior of employees. When examining the effects of sub-dimensions of personality traits on green organizational behavior, it was determined that emotional stability, which is one of the personality traits, effect on the green organizational behavior at a statistically significant level., Bu çalışmada, çalışanların kişilik özelliklerinin yeşil örgütsel davranış üzerindeki etkisinin incelenmesi amaçlanmıştır. Bu bağlamda kişilik özelliklerine sahip yeşil çalışanların daha yeşil örgütsel davranış gösterdiği belirlenmeye çalışılmıştır. Elde edilen veriler, katılımcıların orta düzeyde yeşil örgütsel davranışa sahip oldukları ve yeşil örgütsel davranışın tüm alt boyutlarında orta düzeyde davranışlara sahip oldukları belirlenmiştir. Ayrıca katılımcıların deneyime açık olma konusunda orta düzeyde becerilere sahip oldukları; yüksek düzeyde uyumluluk, vicdanlılık, dışa dönüklük özelliklerine sahip; ve orta-yüksek düzeyde duygusal istikrara sahip olduğu belirlenmiştir. Araştırmadan elde edilen regresyon bulguları, kişilik özelliklerinin çalışanların yeşil örgütsel davranışları üzerinde olumlu ve istatistiksel olarak anlamlı bir etkiye sahip olduğunu ortaya koymuştur. Kişilik özelliklerinin alt boyutlarının yeşil örgütsel davranış üzerindeki etkileri incelendiğinde kişilik özelliklerinden biri olan duygusal istikrarın yeşil örgütsel davranışa istatistiksel olarak anlamlı düzeyde etkisi olduğu belirlenmiştir.
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- 2021
12. The Effect of Personality Traits on Green Organizational Behavior.
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ERBAŞI, Ali, ÇALIŞKAN, Abdullah, and AKDENİZ, Gülsüm
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ORGANIZATIONAL behavior ,PERSONALITY ,OPENNESS to experience ,EMOTIONAL stability ,EXTRAVERSION - Abstract
Copyright of Çankırı Karatekin University Journal of the Faculty of Economics & Administrative Sciences is the property of Cankiri Karatekin University, Faculty of Economics & Administrative Sciences and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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- 2022
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- View/download PDF
13. PERFORMANS DEĞERLENDİRME HATALARINA İLİŞKİN ALGININ ÇALIŞAN SESSİZLİĞİ ÜZERİNDEKİ ETKİSİ
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ERBAŞI, Ali and AKDENİZ, Gülsüm
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Erreurs d'évaluation des performances,silence des employés,bruit des employés ,PERFORMANS DEĞERLENDİRME HATALARI,ÇALIŞAN SESSİZLİĞİ,ÇALIŞAN SESLİLİĞİ ,Business Finance ,Performance Appraisal Errors,employee silence,employee voice ,İşletme Finans - Abstract
Le but de cette étude est d'examiner l'effet de la perception des erreurs d'évaluation du rendement sur le silence des employés. Cet objectif est basé sur l'hypothèse que les erreurs perçues par les employés concernant les processus d'évaluation des performances peuvent les pousser au silence au sein de l'organisation. La méthode d'échantillonnage aléatoire simple a été utilisée dans l'étude, et les enquêtes ont été appliquées aux employés bénévoles pour remplir le questionnaire en visitant 20 succursales de deux banques privées du centre-ville de Konya, sélectionnées au hasard (n = 101). Afin de mesurer les erreurs d'évaluation des performances, Erbaşı et al. (2012) et révisée par Erbaşı (2019), «l'échelle de perception des erreurs d'évaluation des performances» a été utilisée. Afin de mesurer le silence des employés, une «échelle de silence ou de silence des employés» a été utilisée, développée par Van Dyne et LePine (1998) et adaptée en turc par Çetin et Çakmakçı (2012). Les données issues de la recherche ont été analysées dans le cadre du programme SPSS 24.0. Selon les données obtenues, il a été déterminé que la combinaison linéaire de valeurs liées aux erreurs d'évaluation du rendement prédisait le silence des employés de manière statistiquement significative. Dans ce contexte, la perception de 3 erreurs d'évaluation des performances perçues par les employés de la banque (ne pas être informés à l'avance, utiliser des normes et des poids différents, être affectés par des événements récents) a un effet statistiquement significatif sur le silence des employés; Il a été conclu que la perception concernant les 21 erreurs d'évaluation du rendement restantes n'a pas conduit les employés à faire taire leur comportement., Bu araştırmanın amacı, performans değerlendirme hatalarına ilişkin algının çalışan sessizliği üzerindeki etkisini incelemektir. Bu amaç, çalışanların performans değerlendirme süreçleriyle ilgili algıladıkları hataların onları örgüt içinde sessizliğe itebileceği varsayımına dayandırılmıştır. Araştırmada basit tesadüfi örnekleme yöntemi kullanılmıştır. Konya il merkezinde bulunan üç özel bankanın tesadüfi olarak seçilen 23 şubesinde anketler uygulanmıştır (n=131). Performans değerlendirme hatalarına ilişkin algıyı ölçebilmek için Erbaşı vd. (2012) tarafından geliştirilen ve Erbaşı (2019) tarafından revize edilen “Performans değerlendirme hatalarına ilişkin algı ölçeği” kullanılmıştır. Çalışan sessizliğini ölçebilmek için Van Dyne ve LePine (1998) tarafından geliştirilen ve Çetin ve Çakmakçı (2012) tarafından Türkçe’ye uyarlanan “Çalışan sesliliği veya sessizliği ölçeği” kullanılmıştır. Araştırmadan elde edilen veriler SPSS 24.0 programı aracılığıyla çözümlenmiştir. Elde edilen verilere göre performans değerlendirme hatalarına ilişkin algının çalışan sessizliği üzerinde istatistiksel açıdan anlamlı etkisinin olmadığı tespit edilmiştir., The purpose of this study is to examine the effect of perception of performance appraisal errors on employee silence. This purpose is based on the assumption that the errors perceived by the employees regarding the performance appraisal processes may push them to silence within the organization. The simple random sampling method was used in the study, and the surveys were applied to the volunteering employees to fill out the questionnaire by visiting 23 branches of three private banks randomly selected in the city center of Konya (n=131). In order to measure perception of performance appraisal errors, "Perception scale for performance appraisal errors" developed by Erbaşı et al. (2012) and revised by Erbaşı (2019) was used. In order to measure employee silence, "Employee silence or silence scale" developed by Van Dyne and LePine (1998) and adapted into Turkish by Çetin and Çakmakçı (2012) was used. The data obtained from the research were analyzed through the SPSS 24.0 program. According to the data obtained, it was determined that performance appraisal errors don’t statistically significant effect on employee silence.
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- 2020
14. Changes in face and face pareidolia processing in patients with migraine: an ERP study
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Akdeniz, Gülsüm, primary, Gumusyayla, Sadiye, additional, Vural, Gonul, additional, Bektas, Hesna, additional, and Deniz, Orhan, additional
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- 2020
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15. Brain activity underlying face and face pareidolia processing: an ERP study
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Akdeniz, Gülsüm, primary
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- 2020
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16. Electrical source localization by LORETA in patients with epilepsy: Confirmation by postoperative MRI
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Akdeniz, GüLsüM
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Epilepsy -- Care and treatment ,Electroencephalography -- Health aspects -- Research ,Seizures (Medicine) -- Care and treatment ,Magnetic resonance imaging -- Health aspects -- Research ,Health - Abstract
Byline: Gülsüm. Akdeniz Background: Few studies have been conducted that have compared electrical source localization (ESL) results obtained by analyzing ictal patterns in scalp electroencephalogram (EEG) with the brain areas [...]
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- 2016
17. PERFORMANS DEĞERLENDİRME HATALARINA İLİŞKİN ALGININ ÇALIŞAN SESSİZLİĞİ ÜZERİNDEKİ ETKİSİ.
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ERBAŞI, Ali and AKDENİZ, Gülsüm
- Subjects
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EMPLOYEE reviews , *PRIVATE banks , *STATISTICAL sampling , *EMPLOYEE participation in management , *SAMPLING methods , *VOLUNTEER service - Abstract
The purpose of this study is to examine the effect of perception of performance appraisal errors on employee silence. This purpose is based on the assumption that the errors perceived by the employees regarding the performance appraisal processes may push them to silence within the organization. The simple random sampling method was used in the study, and the surveys were applied to the volunteering employees to fill out the questionnaire by visiting 23 branches of three private banks randomly selected in the city center of Konya (n=131). In order to measure perception of performance appraisal errors, "Perception scale for performance appraisal errors" developed by Erbaşı et al. (2012) and revised by Erbaşı (2019) was used. In order to measure employee silence, "Employee silence or silence scale" developed by Van Dyne and LePine (1998) and adapted into Turkish by Çetin and Çakmakçı (2012) was used. The data obtained from the research were analyzed through the SPSS 24.0 program. According to the data obtained, it was determined that performance appraisal errors don't statistically significant effect on employee silence. [ABSTRACT FROM AUTHOR]
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- 2021
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18. Evaluation of relationship between digit ratio (2D: 4D) and epilepsy: Can 2D:4D be a clue for epileptogenesis?
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AKDENİZ, Gülsüm
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Health Care Sciences and Services ,Digit ratio,2D:4D,Edinburg handedness test,epilepsy,hand ,Sağlık Bilimleri ve Hizmetleri - Abstract
Objective: The aim of the study was to investigate the possible association between the 2D:4Dratio and epilepsy in male and female adults, and to compare the ratios of epilepsy patients andhealthy control subjects.Patients and Methods: A case-control study carried out at a neurology and biophyiscsdepartment in Ankara Yıldırım Beyazıt University, Faculty of Medicine from May 2016 to January2017. The 2D:4D ratios of both the left and right hands of 172 epilepsy patients and 202matched healthy controls were recorded. All participants also completed the Edinburghhandedness inventory.Results: A significant positive correlation between the 2D:4D ratio and epilepsy was found forboth females and males; a lower ratio for the left hand was associated with a higher possibilityof epilepsy. In addition, a lower ratio in a specific hand was associated with that hand beingused to complete the handedness test.Conclusions: The 2D:4D ratio serves as a predictor for increased risk of epilepsy. Thus, it couldbe used as a marker to differentiate patients with epilepsy from healthy controls.
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- 2018
19. Dynamic thiol-disulphide homeostasis in patients with Guillain-Barre Syndrome
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Gümüşyayla, Şadiye, primary, Vural, Gönül, additional, Yurtoğulları Çevik, Şükran, additional, Akdeniz, Gülsüm, additional, Neselioğlu, Salim, additional, Deniz, Orhan, additional, and Erel, Özcan, additional
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- 2019
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20. Neural mechanisms underlying visual pareidolia processing: An fMRI study
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Akdeniz, Gülsüm, primary, Toker, Sila, additional, and Atli, Ibrahim, additional
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- 2018
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21. Associations Between Zinc, Copper and Cognitive Performance in Young Turkish Adults
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Akdeniz, Gülsüm, primary, Feyza Yurt, Emine, additional, and Yılmaz, Gülsen, additional
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- 2018
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22. A Validity and Reliability Study of Pareidolia Test
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Akdeniz, Gülsüm, primary
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- 2018
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23. Is digit ratio (2D:4D) an indicator for patients with epilepsy?
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Akdeniz, Gülsüm, additional, Deniz, Orhan, additional, Vural, Gönül, additional, Gümüşyayla, Şadiye, additional, and Bektaş, Hesna, additional
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- 2018
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24. Does Resting-state EEG Band Power Reflect Fluid Intelligence?
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Akdeniz, Gülsüm, primary
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- 2018
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25. Neutrophil/Lymphocyte Ratio In Stroke Patients And Its Relation With Functional Recovery
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Vural, Gönül, primary, Gümüşyayla, Şadiye, additional, and Akdeniz, Gülsüm, additional
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- 2018
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26. Multimodal medical imaging repository and information system in epilepsy surgery
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AKDENİZ, Gülsüm, primary, ATLI, İbrahim, additional, and ÇELEBİ, Fatih Vehbi, additional
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- 2018
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27. Evaluation of visual hallucination based on pareidolia testing in patients with Alzheimer’s Disease
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Gümüşyayla, Şadiye, primary, Bektaş, Hesna, additional, Akdeniz, Gülsüm, additional, Vural, Gönül, additional, and Yön, Mehmet İlker, additional
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- 2018
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28. Complexity Analysis of Resting-State fMRI in Adult Patients with Attention Deficit Hyperactivity Disorder: Brain Entropy
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Akdeniz, Gülsüm, primary
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- 2017
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29. Cerrahi adayı epilepsi hastalarında epileptojenik bölgenin yüzeyel EEG kaynak yerelleştirimi ile belirlenmesi
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Akdeniz, Gülsüm, Özkara, Çiğdem, and Sinir Bilimi Anabilim Dalı
- Subjects
Nöroloji ,Problem solving ,Epilepsy ,Magnetic resonance imaging ,Neurology ,Surgery ,Electroencephalography - Abstract
Elektriksel Kaynak Yerelleştirimi (EKY), EEG?nin zamansal ve uzamsal bileşenlerinin birleşimini saçlı deriden kayıt edilen elektriksel potansiyeller üreten kaynağı tanımlayan model tabanlı bir görüntüleme tekniğidir. Bu çalışmada MRG?de lezyonu olan ve olmayan hastaların epileptojenik alanının tanımlanmasında EKY metodunun katkısının olup olmadığını araştırdık. EKY, medikal tedaviye dirençli nöbetler nedeniyle opere edilmiş ve en az bir yıldır takipli, 18 hastaya uygulandı.Metodun içeriğinde, hastanın üç iç içe geçmiş homojen bölmelerden oluşan (beyin, kafatası ve kafa derisi) gerçek kafa modeli belirlendi. Doku bölütleme ve yüzey üçgenleştirme işlemleri ASA yazılımı kullanılarak yapıldı. Beyin, kafatası ve kafa derisini oluşturan dokular arasındaki yüzey sınırları operasyon sonrası üç boyutlu MR görüntüleme verilerinden elde edildi. Yüzey elektrotları 10-20 sistemine göre yerleştirilerek, saçlı deri iktal EEG paternleri ASA kullanılarak analiz edildi. EKY oluşturmak için dört farklı kaynak yerelleştirme metodu kullanıldı ve elde edilen postoperatif MR görüntülerinde uygulandı. Sonra EKY metodunun doğruluğu çıkarılan beyin alanın postoperative MRG ile karşılaştırılması ile doğrulandı.Onsekiz hastanın 16?sında EKY ile işaretlenen alan beyinden çıkarılan bölge ile uyumlu ve bu hastaların hepsinin ameliyat sonrası nöbetsiz olduğu da belirlenmiştir. İki hastada EKY metodu beyinden çıkarılan alana yakın bir alanı işaret etmiştir. Sonuç olarak, noninvaziv bir yöntem olan EKY metodlarının epileptojenik alanın doğru tanımlanması, intrakraniyal kayıtlama yapılacaksa konulması düşünülen elektrodların sayı ve lokalizasyonunun belirlenmesi aşamalarında katkısı olabilir.Anahtar Kelimeler: Epileptojenik Alan, EEG, Epilepsi, Kaynak Yerelleştirme, Ters problem çözümü Electrical Source Localisation (ESL) is a model-based imaging technique that integrates temporal and spatial components of EEG to identify the generating source of electrical potentials recorded on the scalp. We sought to search whether ESL method can contribute to the identification of the epileptogenic zone in epilepsy surgery candidates who suffer from drug resistant epilepsy. ESL was carried out in 18 patients, who underwent resective surgery and followed-up for at least one year. Method includes, determination of patient?s real head model which consists of 3 homogeneous layers inside each other (brain, skull, scalp) and surface segmentation and triangulation created by using ASA software. Surface boundaries between tissues which constitute the brain, the skull and scalp was obtained from three dimensional MR image data. After placing surface electrodes according to 10-20 system on the scalp, ictal patterns were analyzed using ASA and four different source localization methods. Then the accuracy of the ESL methods was tested by coregistration of the results with the resected brain area which are marked at the post-op MR scans.ESL correctly localized the epileptogenic zone within the resection margins in 18 of 16 patients who had favorable outcome after surgery. ESL method indicated a region close to resected brain area in 2 patients.In conclusion, ESL may contribute to the correct delineation of epileptogenic zone in patients who will undergo to epilepsy surgery whether neuroimaging is normal or not and also to the decision making process of the number and localization of intracranial electrodes in patients who are candidates for invasive recording.Key Words: EEG source localization, EEG, Epilepsy, Source Localization, Inverse Problem 130
- Published
- 2013
30. Neurotrophil/lymphocyte ratio and its relationship with functional recovery in stroke patients.
- Author
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VURAL, Gönül, GÜMÜŞYAYLA, Şadiye, and AKDENİZ, Gülsüm
- Subjects
NEUTROPHILS ,LYMPHOCYTES ,TRANSIENT ischemic attack ,STROKE patients ,STRATEGIC planning - Abstract
Copyright of Medeniyet Medical Journal is the property of Galenos Yayinevi Tic. LTD. STI and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
- Published
- 2018
- Full Text
- View/download PDF
31. Pareidolia Testinin Geçerlilik ve Güvenirlilik Çalışması.
- Author
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Akdeniz, Gülsüm
- Abstract
Objectives: Pareidolia is a phenomenon as the interpretation of something as a familiar pattern in a stimulus or an image by the brain, which actually does not exist. Face pareidolia is the visual illusion and hallucination perception of nonexistent faces. The pareidolia test is used to evoke visual illusions. The aim of the study was to create a simplified version of the pareidolia test and perform the validity and reliability tests. Materials and Methods: The Pareidolia test was conducted with 75 healthy volunteers. To determine the validity of this test, Kendall W analysis was used. For the internal coherence of the test within its subdimensions the Cronbach alpha coefficient was used and Pearson Correlation Analysis was used in the reliability studies. Results: There were 75 healthy adult volunteers in this study, 34 participants were female and 41 were male. The average age of participants was 21.46 ±2.17. The coefficient of Cronbach Alpha was 0.88 which had a high degree of reliability. Conclusion: The pareidolia test is a reliable and valid tool for scanning visual illusions in adults. Findings of the simplified version of the pareidolia test might be extended by collecting clinical data. For example, it would be possible to apply the same procedure to clinical patients with dementia with Lewy bodies or with Alzheimer disease. [ABSTRACT FROM AUTHOR]
- Published
- 2018
- Full Text
- View/download PDF
32. Verification of dipole fit source localization in patients with epilepsy using postoperative MRI.
- Author
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Akdeniz, Gülsüm
- Subjects
- *
DIAGNOSIS of epilepsy , *MAGNETIC resonance imaging of the brain , *NONINVASIVE diagnostic tests , *ELECTROENCEPHALOGRAPHY , *FOLLOW-up studies (Medicine) - Abstract
Objective: Dipole fit source (DFS) localisation is a non-invasive imaging process used to identify the epileptogenic zone (EZ) in the brain. The purpose of the present study was to verify the use of DFS localisation for identifying the EZ in patients with and without lesions using magnetic resonance imaging (MRI). Methods: In this study, DFS localisation was used in 16 patients, of whom 7 had no lesions and 9 had lesions on MRI post-surgery, with at least 3 years of follow-up data. For DFS localisation, different scalp electroencephalogram (EEG) ictal activity was assessed (ictal spikes, rhythmic, paroxysmal fast, and obscured activity). DFSs were superimposed with postoperative MRIs to confirm the accuracy of the determined EZs. Results: The DFS correctly identified EZ localization within the resection area in 14 of the 16 patients. These 14 patients were all seizure free after surgery. The two remaining patients, in whom the DFS was adjacent to the resected area, had a decreased seizure frequency following surgery. Conclusions: DFSs determined during preoperative evaluations can provide information on EZ lateralisation and localisation and contribute to the presurgical decision process. Thus, the accurate identification of EZ boundaries is important and can be achieved more reliably with the use of multiple quantitative EEG analysis methods. [ABSTRACT FROM AUTHOR]
- Published
- 2018
33. Eriyik polimerin viskoz davranışının serbest hacim ile ilişkilendirilmesi
- Author
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Akdeniz, Gülsüm, Yahşi, Uğur, Fizik Anabilim Dalı Fizik Programı, and Fizik Anabilim Dalı
- Subjects
Polimer Bilim ve Teknolojisi ,Fizik ve Fizik Mühendisliği ,Polymer Science and Technology ,Fizik ,Physics and Physics Engineering - Abstract
ÖZETERİYİK POLİMERİN VİSKOZ DAVRANIŞININSERBEST HACİM İLE İLİŞKİLENDİRİLMESİSerbest hacim büyüklüğünün bir fonksiyonu olarak viskoziteye ilişkinçalışmalar son dönemlerde oldukça popüler bir hale gelmiştir [1-2]. Utracki [1],Simha-Somcysky (SS) Boşluk Teorisinden [3] hesap edilen serbest hacimüyüklüğünün bir ölçüsü olarak basınç ve sıcaklığa bağımlı boşluk kesri h ileln η = a0 + a1 ( h( P, T ) + a2 ) şeklinde bir bağıntıyı önermiştir. Burada ai {i=0, 1 ve2}'ler uygunluk parametreleridir. Utracki, SS'deki hal denklemindeki basınçparametresinin iki katını reolojik parametre olarak kullanarak ( Preo = 2 Peos ), bazı* *polimerlerin viskozite verilerini lineer bir hale getirmiştir. Yahsi [4], Utracki'nin haldenklemini bazı dallanmış alkanlar için lineer bir hale getirmediğini göstermiştir.Bu amaçla, difüzyon işlemleri için modifiye edilmiş ve önerilmiş serbesthacim bağıntısı ηT â1/ 2 = C exp ( âγ Ï * Ï f ) , polimerlerin viskoz davranışlarınınincelenmesi için test edilmiştir, fakat buda verileri lineer bir hale getirmemiştir.Burada Ïf segmental molar serbest hacim ve Ï* ise bir segmentin atlaması içinkritik serbest hacim olarak yorumlanabilir. Böylece serbest hacim modeli viskoziteverilerinin yorumlanması için tutarlı bir model değildir.Bununla birlikte transport olaylarında boşluğun büyüklüğü mü yoksa serbesthacim kesri mi baskın rol oynamaktadır sorusu sorulabilir. Serbest hacim tek başınatransport olayını açıklamakta yeterli değildir, buna karşılık serbest hacmin kesribaskın rolü üstlenmektedir, çünkü bir segmentin peş peşe olarak atlaması maddedebulunan boşlukların miktarına bağlıdır ki buna serbest hacim kesri denir. Birmolekülün geçişi için son durumu ele alacağız ve bunun üzerine modeli tesisedeceğiz.Sıvıların istatistik termodinamiği temel alan SS teorisi ve Eyring SignificantStructure (ESS) geçiş teorilerini birleştirilerek Yahsi [2] tarafından öne sürülen geçiş1olayı olarak teorik bir model, serbest hacim niceliğini bir ölçüsü, sıcaklık ve basınçbağımlı boşluk kesri h(P,T)'nin modelde baskın bir rol oynadığını vurgular.Neticede Polystyrene (PS), Polypropylene (PP) ve Acrylonitrile-butadiene-styrene (ABS) gibi polimerler için h(P,T) boşluk kesri cinsinden viskozite içindüzenlenmiş bir model geliştirdik. %6 ya da daha düşük KOK (Karakök OrtalamaKare) değeri ile viskozitede yeterli bir uyum elde ettik.Temmuz 2006 Gülsüm Akdeniz2 ABSTRACTLINKING THE FREE VOLUMES IN VISCOUSBEHAVIOR OF POLYMER LIQUIDSThe study of viscosity, η, as a function of free-volume quantity has beenrecently popular [1-2]. Utracki[1] proposed a relation ln η = a0 + a1 ( h( P,V ) + a2 )where ai {i=0, 1 and 2} are fitting parameters and h is the pressure and temperaturedependent hole fraction as a measure of free volume quantity, computed by using theSimha Somcysky (SS) Hole Theory [3]. He linearized the viscosity data for somepolymers using the rheological pressure parameter twice the equation of state (eos)one ( Preo = 2 Peos ) in the SS. Yet Yahsi [4] showed that it did not linearize the data of* *some branched alkanes.For this purpose, a modified free volume relation, viz.ηT â1/ 2 = C exp ( âγ Ï * Ï f ) proposed for diffusion processes is tested for the viscousbehavior of the polymers, but it did not linearize the data. Here Ïf is segmental molarfree volume and Ï* is interpreted as the critical free volume for jumping of asegment. Therefore such a free volume model is not consistent to interpret theviscosity data.However, question may be raised whether the hole (vacancy) size (freevolume) or free volume fraction plays a dominant role for the transport phenomena.The free volume is not alone sufficient to explain the transportation, but rather thefraction of it plays a major role because successive jumping of a segment is attainedwith a quantity related with an amount of holes distributed in the matter so called the1free volume fraction. We will consider the latter for the transport of amolecule and proceed to establish the model based upon this case.A theoretical model as transport phenomena, proposed by Yahsi [2],combining the Eyring Significant Structure (ESS) transport theory and the SS theorybased on statistical thermodynamics of liquids[3]. exposes that the temperature andpressure dependent hole fraction, h( P, T ) , as a measure of free volume quantity,plays a dominant role in the model.Thereby we have developed a simplified model for the viscosity in terms ofh( P , T ) for the polymer such as Polystyrene (PS), Polypropylene (PP), andAcrylonitrile-butadiene-styrene (ABS). The satisfactory agreement in viscosity isobtained with an rms value %6 or less.July 2006 Gülsüm AKDENİZ2 71
- Published
- 2006
34. Viscous behavior of PS, PP, and ABS in terms of temperature and pressure‐dependent hole fraction
- Author
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Akdeniz, Gülsüm, primary, Yahsi, Ugur, additional, and Tav, Cumali, additional
- Published
- 2010
- Full Text
- View/download PDF
35. ALTERED BRAIN RESPONSE FOR FACE PERCEPTION IN SCHIZOPHRENIA.
- Author
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Kesik, Sena and Akdeniz, Gülsüm
- Subjects
- *
PEOPLE with schizophrenia , *SCHIZOPHRENIA , *FACE perception , *FACIAL expression , *MEDICAL care - Abstract
Objective: Schizophrenic patients have difficulty in facial recognition, emotional perception, and discrimination. The N170 component of Event Related Potential (ERP) is studied on schizophrenic patients. N170 is a negativity peaking around 170 milliseconds after stimulus onset and related to facial perception. The objective of this study is to examine N170 responses of schizophrenic patients related to their facial perception in previous studies. Methods: We searched the literature using keyword searching (face perception in schizophrenia) in PubMed. When face identification tasks were performed on patients with schizophrenia, N170 amplitudes to their own faces were found significantly lower than healthy controls and it is commented as difficulty in perceiving their own faces. In the comparison of N170 responses to emotional and neutral faces, larger N170 amplitudes for emotional faces than neutral faces were found in healthy controls while there was no significant difference for patients between emotional and neutral faces. It is thought that to be related to introversion in patients. N170 amplitudes of patients to faces with negative emotione specially fearful faces were lower than controls but no significant difference between patients and controls for neutral faces or faces with positive emotions. This finding is in agreement with the information that patients have partial difficulty in recognizing fearful faces. Results: The decreased N170 response in schizophrenia is directly related to deficient in face-specific processing. Discussion: N170 reflects deficiency in processing the detection of structural features of face and recognition of facial emotions in schizophrenia. [ABSTRACT FROM AUTHOR]
- Published
- 2018
36. ŞİZOFRENİDE YÜZ ALGISI İÇİN DEĞİŞMİŞ BEYİN YANITI.
- Author
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Kesik, Sena and Akdeniz, Gülsüm
- Abstract
Amaç: Şizofreni hastalarının yüz tanıma, duyguları algılama ve ayırt etmede zorluk yaşadıkları bilinmektedir. Olaya ilişkin potansiyel (OİP) kayıtlamalarından N170 dalgası şizofreni hastalarında çalışılmaktadır. N170 dalgası, uyaran gösterildikten sonra yaklaşık 170. milisaniyede oluşan negatif piktir ve yüz algısı ile ilişkilidir. Bu çalışmadaki amaç, literatürde şizofreni hastalarındaki yüz algısına karşı değişen N170 yanıtlarını incelemektir. Gereç-Yöntem: PubMed'de anahtar sözcük kelimesi kullanarak literatür taraması yaptık (şizofrenide yüz algısı). Şizofreni hastalarına kimlik saptamaya yönelik testler yapıldığında kendi yüzlerine karşı N170 genlikleri kontrollerden anlamlı düşük bulunmuştur ve bu durum kendi yüzlerini algılamada kısmen zorluk çektikleri şeklinde yorumlanmıştır. Duygusal ve nötral yüzlere karşı N170 yanıtları karşılaştırıldığında sağlıklı kontrollerde duygusal yüzlere karşı nötral yüzlerden yüksek N170 genlikleri bulunurken şizofreni hastalarında duygusal ve nötral yüzler arasında anlamlı bir farklılık gözlenmemiştir. Bunun hastalardaki içedönüklükle ilişkili olduğu düşünülmektedir. Hastaların negatif duygu içeren özellikle korkulu yüzler için N170 genlikleri kontrollerden düşük bulunurken pozitif duygu içeren veya nötral yüzlerde hastalarla kontroller arasında anlamlı farklılık bulunmamıştır. Bu bulgu, korkulu yüzleri tanımada hastaların kısmi zorluk çektiği bilgisiyle uyumludur. Bulgular: Şizofrenide azalmış N170 cevabının yüze özgü algıda eksiklikle direkt ilişkili olduğunu göstermiştir. Sonuç: N170 dalgası, şizofrenide yüzün yapısal özelliklerinin belirlenmesi ve yüz duygularının tanınması süreçlerindeki yetersizliği yansıtmaktadır. [ABSTRACT FROM AUTHOR]
- Published
- 2018
37. YÜZ GÖRME SIRASINDA BEYİNDEKİ OSİLASYONLAR.
- Author
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Ceran, Beyzanur and Akdeniz, Gülsüm
- Abstract
Amaç: Sosyal hayatta en çok kullanılan iletişim aracımız yüzdür. Tıbbi görüntüleme çalışmaları, çeşitli alanlarda yüz işleminin beyinde modüle edildiğini göstermiştir. Bizim için yüzün beyinde nasıl algılandığı bir merak konusudur. EEG kayıtlaması ile emosyon içeren ve içermeyen yüz algısı çalışmaları yapılmaktadır. Bizim bu çalışmadaki amacımız beyindeki nötr yüz görme sırasında oluşan osilasyon değişimlerini elde etmektir. Yöntem: Yüz algısı ile ilişkili biyoelektrik osilasyonlar beş sağlıklı gönüllüden kaydedilmiştir. Beyin elektriksel değişim kayıtları AYBÜ Elektronörofizyoloji Laboratuvarında, 32 kanal EEG sistemi ve izole ortam içinde alınmıştır. Katılımcılara 20 farklı, nötr, siyah beyaz renkte 1000 ms süreli yüz fotoğrafı gösterilmiştir. EEG kayıtlamaları sırasında sağlıklı gönüllü katılımcılardan bu yüzleri gördüğü zaman butona basmaları istenmiştir. Elde edilen veriler temporal, frontal, oksibital ve parietal lob için analiz edilerek, beyindeki osilasyonlar elde edilmiştir. Sonuç: Yüze karşı oluşan beyin osilasyon yanıtlarında 170. ms de ortaya çıkan aktiviteler 250. ms ortaya çıkan aktiviteden daha anlamlı olduğu belirlendi. Erken dönem beyin osilasyon yanıtlarında sağ temporal bölgede sol temporal bölgedekinden daha büyüktü. Yüz görme sırasında beynin sağ hemisferinde sol hemisferden daha fazla yanıt elde edilmiştir. Tartışma: Yüz algısında erken dönem beyin osilasyonları geç dönem osilasyonlarından daha etkili olabilir. [ABSTRACT FROM AUTHOR]
- Published
- 2018
38. BRAIN OSCILLATIONS DURING FACE SIGHT.
- Author
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Ceran, Beyzanur and Akdeniz, Gülsüm
- Subjects
- *
BRAIN imaging , *BRAIN stimulation , *DIAGNOSTIC imaging , *OSCILLATIONS , *FACE perception - Abstract
Objective: Faces are the most widely used communication tool in social life. Medical imaging studies have shown that face processing in several areas is modulated in the brain. How a face is perceived in the brain is a matter of curiosity. Neutral face and emotional face perception studies are conducted with EEG. The present study aimed to obtain the oscillation changes which occur in the brain during neutral face perception. Method: Bioelectrical oscillations associated with face perception were recorded from five healthy volunteers. The electrical changes of the brain were recorded in the AYBU Electronurophysiology Laboratory, with a 32-channel EEG system in an isolated room. The participants were shown a face photograph of 20 different, neutral, black and white colors and duration time of each photograph was 1000 ms. During the EEG recording, healthy volunteers were asked to press the button when they saw these faces. Data were analyzed for temporal, frontal, occipital and parietal lobes, and brain oscillations were obtained. Result: For the brain oscillation responses to faces, the activities that occurred in the 170. ms were determined to be more meaningful than the activity occurring in the 250. ms. Early brain oscillation responses were greater in the right temporal region than in the left temporal region. During face perception, the right hemisphere of the brain more than the left hemisphere was obtained. Discussion: Early brain oscillations in face perception may be more enlightening than late oscillations. [ABSTRACT FROM AUTHOR]
- Published
- 2018
39. TIP FAKÜLTESİ ÖĞRENCİLERİNDE HUZURSUZ BACAK SENDROMUNUN AKADEMİK BAŞARIYA ETKİSİ.
- Author
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ŞEN, Abdullah Beşir, BOZKUŞ, Elif, AKDENİZ, Gülsüm, YÖN, Mehmet İlker, and YOLDAŞ, Tahir Kurtuluş
- Abstract
Copyright of Ankara Medical Journal is the property of Yildirim Beyazit Üniversity and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
- Published
- 2018
40. EFFECT OF RESTLESS LEG SYNDROME ON ACADEMIC SUCCESS IN MEDICAL FACULTY STUDENTS.
- Author
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ŞEN, Abdullah Beşir, BOZKUŞ, Elif, AKDENİZ, Gülsüm, YÖN, Mehmet İlker, and YOLDAŞ, Tahir Kurtuluş
- Subjects
RESTLESS legs syndrome ,MEDICAL students ,DROWSINESS ,EPWORTH Sleepiness Scale ,CHI-squared test - Abstract
Objective: There is little research about the effect of Restles Leg Syndrome (RLS) on academic success and day time sleepiness. In this study, we aimed to determine the effect of RLS on day time sleepiness and the effect of RLS on academic gadepoint average (GPA). Methods: Our study included 171 preclinic students in 2. and 3. years at AYBU Medical Faculty. RLS diagnosis was made according to International Classification of Sleep Disorders-3. International Restless Legs Syndrome Study Group (IRLSSG) survey was used to define the intensity of RLS. Epworth Sleepiness Scale (ESS) was used tofor the evaluation of the day time sleepiness of the students. Chi-square test was used to for the statistical analysis between GPA and RLS severity, RLS frequency and day time sleepiness. Results: One-hundred-and-twenty of the students were women (70.2%), 51 of the students were men (29.8%). Seventeen of the students diagnosed as RLS (9.9%). Thirteen of them were women (76.5%) and only 4 of them were men (23.5%). GPA of the students with RLS was statically lower than the other students' GPA(p=0.02). There was no statistically significant difference between GPA and RLS intensity (p=0.516). There was statistically significant difference between the frequency of RLS symptoms and GPA (p=0.045). Among students with RLS, students who have excessive day time sleepiness have statistically significantly lower GPA (p=0.038). Discussion: RLS is a very common sleep related movement disorder which causes academic failure at school and concentration difficulty as well as in somnia and excessive day time sleepiness. Academic failure seems to have close relation with RLS frequency rather than RLS intensity. [ABSTRACT FROM AUTHOR]
- Published
- 2018
41. THE RELATION OF SERUM COPPER AND ZINC LEVELS WITH COGNITIVE FUNCTION: A PRELIMINARY STUDY.
- Author
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BAHADIR, Rumeysa, AKDENİZ, Gülsüm, YURT, Emine Feyza, and YILMAZ, Gülsen
- Subjects
- *
PHYSIOLOGICAL effects of zinc , *PHYSIOLOGICAL effects of copper , *COGNITIVE ability - Abstract
Introduction: It is known that trace elements like copper, zinc, cadmium, selenium play a role in metabolic processes and oxidation‐reduction reactions in central nervous system and could have a possible effect on cognitive function. The aim of this study to investigate the relation of copper and zinc levels with cognitive functions. Material and Methods: 22 healthy volunteers participated in this study were tested with MOCA test which reflects cognitive functions. Also their bloods were drawn simultaneously and copper and zinc levels were measured with Atomic Absorption Spectroscopy (AAS). The correlation between copper, zinc levels and MOCA test result were investigated. Results: There is a negative significant correlation between age and zinc level (r=‐ 0.707, p<0.001); attention and copper level (r=‐0.469, p= 0.028); also age and visual perception (r=‐0.43, p=0.04). Discussion: A negative correlation between age and zinc level was found in this study in line with researches suggesting decreasing amount of zinc with age. Visual perception is decreased with age as expected but it is not related with copper and zinc levels. The negative correlation between copper and attention is consistent with other studies. The mechanism for copper's effect on cognition is believed to be its interaction with Aβ peptide causing Aβ aggregation and the production of hydrogen peroxide, an oxidant and neurotoxin. [ABSTRACT FROM AUTHOR]
- Published
- 2017
42. QUANTITATIVE EEG BETA FREQUENCY RESPONSE IN PATIENTS WITH CHRONIC OCCUPATIONAL EXPOSURE TO MANGANESE.
- Author
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ÖZEN, Nurşen, AKDENİZ, Gülsüm, DOĞAN, Gamze, and ÇELİKER, Gülay
- Subjects
- *
PHYSIOLOGICAL effects of manganese , *COGNITIVE ability , *NEUROTOXICOLOGY - Abstract
Introduction: Chronic exposure to Manganese (Mn) by inhalation in workers is associated with neurotoxicological effects including neurobehavioral changes and parkinsonism. Alterations in the electroencephalography (EEG) data may reflect pathological conditions which are caused by toxin agents in the central nervous system (CNS). The aim of this study was to investigate to toxic effects of Mn on the cognitive functions as mediated by frontal lobe through quantitative EEG analyzing. Material and Methods: Resting state‐EEG recordings were taken from 27 patients with chronic occupational exposure to manganese and 16 healty volunteer participants (control group) with a 32 channel EEG recording system. The beta power values were obtained from the EEG recordings with the BESA program. For quantitative EEG analysis, artifact free 45 epochs lasting 2 s each were selected and the beta frequency power values were calculted for frontal lob. Results: Beta power values of the chronic occupational exposure to manganese patients (9,20 μV2) decreased compared to control group (16,92 μV2) in frontal lobe. Discussion: The major function of the frontal lobe is carring out higher mental processes such as thinking, decision making, and planning. It's a known fact there is a relationship between beta waves and cognitive functions. According to our findings the low beta values (frontal lobe) in patients with chronic occupational exposure to manganese show long term manganese exposure affect the higher mental processes. [ABSTRACT FROM AUTHOR]
- Published
- 2017
43. MEASURING THE COGNITIVE DISTINGUISHING POWER OF THE NEUROLOGY PATIENTS WITH THE MONTREAL COGNITIVE ASSESSMENT SCALE.
- Author
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YAHYA, Hanifa Hamza, AKDENİZ, Gülsüm, YILDIRIM, Esra, and VURAL, Gönül
- Subjects
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MILD cognitive impairment , *MONTREAL Cognitive Assessment , *COGNITION disorders - Abstract
Introduction: The Montreal Cognitive Assessment Scale (MOCA) is a test that can be used to detect mild cognitive impairment. Our aim in this study is to determine the power of cognitive discrimination between groups and between sets by measuring the functions of visual spatial functions, naming, memory, attention, language, abstract thinking, delayed recall and orientation among healthy volunteers with neurological disease with MOCA. Material and methods: The MOCA test was administered by researchers to 21 volunteer participants (9 males, 12 females) and 39 healthy volunteer participants (14 males, 25 females). The MOCA test consists of 8 sets of visual spatial functions, naming, memory, attention, language, abstract thinking, delayed recall and orientation and the ability to distinguish the cognitive measurement from the answers given by the participants was evaluated. Results: The mean total MOCA score of the neurological patients was 18.71 while the mean total score of the volunteers was 25.53. Healthy individuals were found to be 17% higher in visual spatial functions, 14% in naming, 24% in attention, 26% in language, 23% in abstract thinking, 25% in delayed recall, and 12% in orientation from neurological patients. The highest mean score difference (1.54) between neurological patients and healthy subjects was obtained from the attention set, and the lowest mean score difference (0.43) from the nomenclature set. Discussion: The MOCA test showed that cognitive perceptions decreased, primarily in language and attention, in neurological patients. This interpreted the MOCA test as having the greatest power to distinguish the attention and language from the cognitive processes from the other cognitive processes. [ABSTRACT FROM AUTHOR]
- Published
- 2017
44. SEEING FAMOUS AND FAMELESS PEOPLE: COMPARISON OF EEG‐BETA WAVES IN TEMPORAL LOB.
- Author
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SAYIT, Rumeysa, DOĞAN, Gamze, TALEB, Farouk, and AKDENİZ, Gülsüm
- Subjects
NEURON analysis ,ELECTROENCEPHALOGRAPHY ,TEMPORAL lobe - Abstract
Introduction: R. Q. Quiroga and his colleagues investigated single neurons in the brain which are devoted to single people or objects in 2005. Various pictures of Jennifer Aniston elicited a response in a single neuron inside the temporal lobe and they named the neuron as Jennifer Anderson Neuron. In this study we aimed to explore bioelectrical aspects of this phenomena by electroencephalography (EEG). Material and Methods: EEG recordings were taken from 2 healty volunteer participants while they were watching pictures of famous (20) and fameless (15) people with a 32 channel EEG recording system. Beta power values were calculated from the EEG recordings for the temporal lob. Results: Beta power value for famous people was 20, 15μV2 while it was 12, 25 μV2 for fameless people in the temporal lobe. Conclusion: Beta is one of the EEG waves which responsible for higher cognitive functions and also visual neurons are located in the temporal lob. We interpreted higher beta power value for famous people as famous‐specific neurons create more electrical activity than non‐specific visual neurons in the temporal lob. These findings are primary results of our research we hope that this study pave the way to explore the electrical source of ‘Jennifer Anderson Neuron'. [ABSTRACT FROM AUTHOR]
- Published
- 2017
45. DOES THE EXCESSIVE DAYTIME SLEEPING AFFECT ACADEMIC PERFORMANCE AMONG MEDICAL STUDENTS?
- Author
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ÖZGEN, Cem, EVRAN, Ebru, AKDENİZ, Gülsüm, GÜLER, Selda KESKİN, and YOLDAŞ, Tahir Kurtuluş
- Subjects
DROWSINESS ,PSYCHOLOGICAL burnout ,MEDICAL students - Abstract
Introduction: Quality of sleep and excessive daytime sleepiness (EDS) affect cognitive ability and performance of medical students. Burnout syndrome is a three‐dimensional clinical syndrome caused by stress at work. Maslach Burnout Inventory has 3 subgroups Cynicism(MBI‐C), Emotional Exhaustion(MBI‐EE), Professional Efficacy(MBI‐PE) Daytime sleepiness may be related with burnout syndrome in health science students. The study aimed to examine the prevalence of daytime sleepiness and Burnout Syndrome and the relationship between daytime sleepiness and Burnout Syndrome among medical students and Health Vocational school of higher education students and to explore its relationship with academic performance, living place and physical activity. Material and Methods: This was a cross‐sectional study that was conducted among 135 undergraduate 1st, 2nd, 3rd year medical students and Health Vocational school of higher education students, using the Epworth Sleepiness Scale (ESS), Maslach Burnout Inventory (MBI) and a sociodemographic survey in Ankara Yıldırım Beyazıt University in term 2016‐2017. Students were divided into 5 groups according to ESS score. SPSS 16.0 was used to analyse the data. Result: 45 Students was men (%33,3) and 90 Students are women (%66,7). Average of age was 21,02 +/‐ 2,57(SD). Average of sleeping hours at night 7,5 +/‐ 1,3(SD). Average BMI 21,73 +/‐ 3,05(SD). Students with Academic success >=60 of 100 mean ESS score was 3,00+/‐1,25(SD) and students with Academic success <60 of 100 mean ESS score was 1,78+/‐0,84(SD)(p<0,01). Discussion: ESS scores did not statistically correlate with sleep time and MBI scores. ESS scores were significantly higher in those who had academic success below 60 of 100 points. [ABSTRACT FROM AUTHOR]
- Published
- 2017
46. MIGRAINE WITH VISUAL AURA OR OCCIPITAL ATTACK.
- Author
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HACIİBRAHİMOĞLU, Hacer Su, KARADAĞ, Yusuf, GÜLER, Selda Keskin, AKDENİZ, Gülsüm, and YOLDAŞ, Tahir Kurtuluş
- Subjects
MIGRAINE ,EPILEPSY ,OCCIPITAL lobe - Abstract
Introduction: Migraine and epilepsy are two sicknesses we encounter fairly common in all societies. The goal of our project is to emphasize their similar characteristics and the important clues about their distinctive diagnosis. Material and methods: 3350 epilepsy patient files at ATRH were investigated. We included patients with occipital lobe epilepsy. Those with unspecified headaches, who stopped their follow‐up for the past 10 years, with mental retardation, with unclear diagnosis were excluded from our project. Results: 77% of the patients were females and the mean age was 35%. 66% of them used a single medicine which is anti‐epileptic, 3.3% had polytherapy. The incidence for focal seizure was 33.3% generalized seizure 48.1%, occipital seizure 11.1%, and the incidence of patients that are non‐convulsive were 7.4%. 59.3% of the patients suffered headaches. Seizures related to temporary visual complaints were determined on all of them. 20 patients had complaints about visual hallucinations such as coloured lights, circular rings and shiny balls. 15 patients complained about blind spots, blindness and partially lacking field of vision. Discussion: Visual complaints related to epilepsy seizures carry fairly similar characteristics of aura that seen before headaches migraine patients. Furthermore, the only symptom may be these visual complaints, convulsion may not accompany. There is a probability that more than half of the patients would suffer headaches. OLE should be kept in mind for patients with temporary visual hallucinations or negative visual complaints of OLE patients that may be cause by false migraine diagnosis that delayed their treatment. [ABSTRACT FROM AUTHOR]
- Published
- 2017
47. Epilepsi Hastalarında Beynin Kaotiklik Seviyesini İnvaziv İktal EEG Veri Analizi İle Belirleme.
- Author
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Akdeniz, Gülsüm, Gümüşyayla, Şadiye, Vural, Gönül, Bektaş, Hesna, and Deniz, Orhan
- Abstract
Giriş: Epilepsi hastalarında nöbet sırasında beyin biyodinamikleri değişmektedir. Beynin yüzeyine/içine veya saçlı deri yüzeyinden elektrotlar vasıtası ile beynin biyofiziksel potansiyellerinin ölçümü elektroensefalogram (EEG) sinyalleri olarak adlandırılır. Fizyolojik olan veya olmayan artefaktlar nedeni ile zaman zaman nöbete neden olan beyin bölgesi ile ilişkili epileptik aktiviteyi ve beynin kaotiklik seviyesini tanımlamak zor olmaktadır. Amacımız, epilepsi hastalarında invaziv iktal EEG verileri kullanarak beynin kaotiklik düzeyi hakkında bilgi sağlamak ve sağlıklı bireylerle karşılaştırılarak aradaki farkın ortaya konmasıdır. Materyal ve Yöntem: On epilepsi hastasının invaziv iktal EEG verileri ile on sağlıklı bireyin EEG sinyallerine kantitatif hale dönüştürmek için dört seviye dalgacık dönüşümü yapılmıştır. İnvaziv iktal EEG verileri Bonn Üniversitesinden (http://epileptologie- bonn.de/cms/upload/workgroup/lehnertz/eegdata.html) elde edilmiştir. Her bir dizi için beynin kaotiklik seviyesi hesaplanarak, sağlıklı ve epilepsi bireylerin kaotiklik değerleri grafik üzerinde gösterilmiştir. Bulgular: İnvaziv EEG verilerinin kantitatif analizinden elde edilen bulgularda, epilepsi hastalarının kaotiklik değerleri, sağlıklı gönüllü katılımcıların kaotiklik değerlerine göre daha yüksek bulunmuştur. En yüksek kaotiklik seviyesi dördüncü seviyede elde edilmiştir. Dalgacık dönüşümünde seviye arttıkça kaotikliğin arttığı saptanmıştır. Tartışma ve Sonuç: Sınırlı sayıdaki az veri ile elde edilen bu bulguların sonuçları ön çalışma sonuçları olmasına rağmen kantitatif EEGnin kullanımı ile beynin kaotiklik seviyesi hakkında bilgi verici olduğu görülmüştür. Çıplak gözle bakıldığında karar verilemeyen EEG sinyallerinde, kantitatif EEGden kaotiklik değerlerine bakılarak EEG aktivitelerinin durumundan hareketle beyin kaotiklik seviyesine karar verilebilir. Elde edilen sonuçlar, bireyin o zaman diliminde nöbet geçirip geçirmediği hakkında bilgi sağlayabilecektir. Özellikle elektriksel kaynak yerelleştirme çalışmalarında EEG ön analizi olarak kaotiklik hesabının kullanımı epilepsi hastalarında nöbete neden olan beyin bölgesinin araştırılmasında fayda sağlayabilecektir. [ABSTRACT FROM AUTHOR]
- Published
- 2016
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