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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]

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]

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.)

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]

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.)

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 [...]

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]

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.)

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]

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]

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]

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]

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]

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]

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.)

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]

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]

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]

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]

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]

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]

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]

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]