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Start Over Author "Satoshi Ukai" Journal neuropsychobiology
7 results on '"Satoshi Ukai"'

1. Information Processing Flow and Neural Activations in the Dorsolateral Prefrontal Cortex in the Stroop Task in Schizophrenic Patients

Author

Yuko Mizuno-Matsumoto, Asao Ogawa, Satoshi Ukai, Masakiyo Yamamoto, Norihiko Fujita, Masatoshi Takeda, Toshiki Yoshimine, Ryouhei Ishii, Kazuhiro Shinosaki, and Shunsuke Kawaguchi

Subjects
medicine.diagnostic_test, Information processing, Cognition, Magnetoencephalography, Dorsolateral prefrontal cortex, Psychiatry and Mental health, Neuropsychology and Physiological Psychology, medicine.anatomical_structure, medicine, Synthetic-aperture magnetometry, Prefrontal cortex, Psychology, Image resolution, Neuroscience, Biological Psychiatry, Stroop effect
Abstract

Using a spatially filtered magnetoencephalography analysis (synthetic aperture magnetometry), we estimated neural activations in the Stroop task in nearly real time for schizophrenic patients with/without auditory hallucinations and for normal control subjects. In addition, auditory hallucinations were examined through the information processing flow of the brain neural network, including the frontal regions. One hundred unaveraged magnetoencephalography signals during the incongruent stimulus responses were analyzed with a time window of 200 ms in steps of 50 ms. In the 25–60-Hz band, cortical regions that showed significant current source density changes were examined for each time window. The three groups showed significantly decreased current source density, corresponding to neural activation, with temporal overlap along the fundamental cognitive information processing flow: sensory input system, executive control system, motor output system. Transient neural activations in the dorsolateral prefrontal cortexwere bilateral with left-side dominancy for normal controls, left-lateralized for nonhallucinators and right-lateralized for hallucinators. Our results suggest that the dysfunction in the left dorsolateral prefrontal cortex was related to auditory hallucinations, while the information processing flow was unaffected in the schizophrenic subjects in the Stroop task.

Published
2005
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2. Spatially filtered magnetoencephalographic analysis of cortical oscillatory changes in basic brain rhythms during the Japanese 'Shiritori' Word Generation Task

Author

Satoshi Ukai, Asao Ogawa, Masakiyo Yamamoto, Norihiko Fujita, Masatoshi Takeda, Yuko Mizuno-Matsumoto, Toshiki Yoshimine, Kazuhiro Shinosaki, Ryouhei Ishii, and Shunsuke Kawaguchi

Subjects
Adult, Male, Word generation, Speech recognition, Functional Laterality, Task (project management), Rhythm, Japan, Task Performance and Analysis, medicine, Humans, Cortical Synchronization, Biological Psychiatry, Language, Communication, Brain Mapping, medicine.diagnostic_test, business.industry, Event related desynchronization, Magnetoencephalography, Cognition, Magnetic Resonance Imaging, Temporal Lobe, Frontal Lobe, Psychiatry and Mental health, Neuropsychology and Physiological Psychology, Reading, Female, Synthetic-aperture magnetometry, business, Psychology, Word (computer architecture)
Abstract

Background: ‘Shiritori’ (capping verses) is a traditional Japanese word generation game, and is very familiar to native Japanese speakers. The shiritori task is expected to more strongly activate temporal language-related regions than conventional word generation to letters because of its characteristic way to make cue letters. Objectives: The aim of this study was to examine the cortical oscillatory changes in basic brain rhythms during silently performing a shiritori task. Methods: Using synthetic aperture magnetometry (SAM) analysis of magnetoencephalography, we estimated the tomographic distributions of the statistically significant differences of the power in the alpha and beta frequency bands between the resting and the task periods. Results: Significant event-related desynchronization (ERD) in the 8- to 25-Hz band, thought to reflect neural activation, was localized within task-related cortical regions with left-side dominance. The significant ERDs were estimated in both the frontal and temporal language-related regions encompassing Broca’s and Wernicke’s areas, although previous neuroimaging studies using word generation to letters showed neural activation predominantly in frontal regions. Conclusions: Our results show the potential of SAM analysis for reliable brain mapping of language processing, and suggest that the shiritori task might be more suitable for examining the language-related network in the brain than conventional word generation to letters.

Published
2005

3. Information processing flow and neural activations in the dorsolateral prefrontal cortex in the Stroop task in schizophrenic patients. A spatially filtered MEG analysis with high temporal and spatial resolution

Author

Shunsuke, Kawaguchi, Satoshi, Ukai, Kazuhiro, Shinosaki, Ryouhei, Ishii, Masakiyo, Yamamoto, Asao, Ogawa, Yuko, Mizuno-Matsumoto, Norihiko, Fujita, Toshiki, Yoshimine, and Masatoshi, Takeda

Subjects
Adult, Male, Brain Mapping, Time Factors, Adolescent, Hallucinations, Magnetoencephalography, Prefrontal Cortex, Magnetic Resonance Imaging, Functional Laterality, Mental Processes, Pattern Recognition, Visual, Schizophrenia, Humans, Female, Mental Status Schedule, Photic Stimulation, Demography
Abstract

Using a spatially filtered magnetoencephalography analysis (synthetic aperture magnetometry), we estimated neural activations in the Stroop task in nearly real time for schizophrenic patients with/without auditory hallucinations and for normal control subjects. In addition, auditory hallucinations were examined through the information processing flow of the brain neural network, including the frontal regions. One hundred unaveraged magnetoencephalography signals during the incongruent stimulus responses were analyzed with a time window of 200 ms in steps of 50 ms. In the 25-60-Hz band, cortical regions that showed significant current source density changes were examined for each time window. The three groups showed significantly decreased current source density, corresponding to neural activation, with temporal overlap along the fundamental cognitive information processing flow: sensory input system, executive control system, motor output system. Transient neural activations in the dorsolateral prefrontal cortex were bilateral with left-side dominancy for normal controls, left-lateralized for nonhallucinators and right-lateralized for hallucinators. Our results suggest that the dysfunction in the left dorsolateral prefrontal cortex was related to auditory hallucinations, while the information processing flow was unaffected in the schizophrenic subjects in the Stroop task.

Published
2005

4. Contents Vol. 53, 2006

Author

Friedrich-M. Wurst, Yoshiteru Takekita, Masaki Kato, Tsuyoshi Fukuda, Ulrich Schnyder, Jianjun Gao, Thomas Noll, Guoyin Feng, Byung Joo Ham, Asao Ogawa, Qinghe Xing, Toshiki Yoshimine, Xiaocai Gao, Lin He, Norihiko Fujita, Yuka Ikenaga, Young Hoon Ko, Xiaoyang Zeng, Masatoshi Takeda, Ducksun Ahn, Fangli Dang, Toshihiko Kinoshita, Taner Güvenir, Gaku Okugawa, Meyoung-Kon Kim, Kenji Nobuhara, Jun Li, Kazuhiro Shinosaki, Jeong-Hyun Park, Gerhard A. Wiesbeck, Ihn-Geun Choi, Fuchang Zhang, Ryouhei Ishii, Murat Örmen, Megumi Yamashita, Norbert Wodarz, Xueqing Qian, Junichi Azuma, In Kyoon Lyoo, Masakiyo Yamamoto, Myoung-Jin Choi, H.-G. Weijers, Sook-Haeng Joe, Gultekin Tas, Wei Qin, Seung-Hyun Kim, Marc Walter, Gabriella Milos, Juneyoung Lee, Min Soo Lee, Yuko Mizuno-Matsumoto, Jobst Boening, Young-Mee Lee, Satoshi Ukai, Tingwei Guo, Jung-Jae Lee, Bernd Kraemer, Fatma Varol Tas, Kazuhiro Fukuda, Aba Delsignore, Burcu Cakaloz, Masataka Wakeno, Shunsuke Kawaguchi, Kenneth M. Dürsteler-MacFarland, Hongfen Chang, Woong Cho, Leen Kim, Urs Hepp, In-Kwa Jung, and Zijian Zheng

Subjects
Psychiatry and Mental health, Neuropsychology and Physiological Psychology, Biological Psychiatry
Published
2006
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5. Contents Vol. 51, 2005

Author

Joel Hasan, Bernd Saletu, Hyun Joo Hong, Nak Kyung Choi, Przemysław A. Bogacki, Jen-Yeu Chen, Yuko Mizuno-Matsumoto, Manoel Jorge Nobre, Norihiko Fujita, Alina Borkowska, Chan-Hyung Kim, Michèle Schwald, Young Shin Kim, Eila Repo-Tiihonen, Takashi Oka, Josef Adelbauer, Jukka Niemi, Marcus Lira Brandão, Yoshifumi Koshino, Gerda M. Saletu-Zyhlarz, Guido Bondolfi, Asao Ogawa, Birgitt Wiese, Ryouhei Ishii, Tero Hallikainen, Kazuhiro Shinosaki, Tatsuya Nagasawa, Sharon Ratner, Isabella Heuser, Toshiki Yoshimine, Amanda Ribeiro de Oliveira, Ying-Chieh Wang, Silvia Parapatics, Alpo Värri, Félicien Karege, Udo Schneider, Antti Saastamoinen, Masakiyo Yamamoto, Yuji Wada, Eero Huupponen, Nathaniel Laor, Malek Bajbouj, Nicola Gervasoni, Abraham Weizman, Małgorzata Wojtanowska-Bogacka, Hinderk M. Emrich, Masatoshi Takeda, Sari-Leena Himanen, Jean-Michel Aubry, Se Joo Kim, Janusz K. Rybakowski, Hong Shick Lee, Dana Lerer-Amisar, Alexander Saletu, Anne Eloranta, Peter Anderer, Satoshi Ukai, Włodzimierz Oniszczenko, Tsutomu Takeda, Torsten Passie, Maria Luiza Nunes Mamede Rosa, Wojciech Ł. Dragan, Yasuhiro Kawasaki, Paz Toren, Jussi Virkkala, Ying-Jay Liou, Wolfgang Prause, Yoko Komai, Jari Tiihonen, Mitsuru Kikuchi, Shunsuke Kawaguchi, Christian Osiek, Matthias Karst, Hanna Putz, Takahiro Tsukada, Takeshi Okamoto, Gilles Bertschy, I-Ching Lai, Masato Higashima, and Peter Neu

Subjects
Psychiatry and Mental health, Neuropsychology and Physiological Psychology, Biological Psychiatry
Published
2005
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6. Subject Index Vol. 51, 2005

Author

Manoel Jorge Nobre, Takeshi Okamoto, Chan-Hyung Kim, Ying-Jay Liou, Anne Eloranta, Abraham Weizman, Josef Adelbauer, Alpo Värri, Yoko Komai, Hong Shick Lee, Ryouhei Ishii, Jukka Niemi, Toshiki Yoshimine, Małgorzata Wojtanowska-Bogacka, Nak Kyung Choi, Yuko Mizuno-Matsumoto, Sari-Leena Himanen, Dana Lerer-Amisar, Asao Ogawa, Masakiyo Yamamoto, Yoshifumi Koshino, Tatsuya Nagasawa, Amanda Ribeiro de Oliveira, Sharon Ratner, Félicien Karege, Udo Schneider, Takashi Oka, Isabella Heuser, Malek Bajbouj, Kazuhiro Shinosaki, Włodzimierz Oniszczenko, Torsten Passie, Jari Tiihonen, Joel Hasan, Bernd Saletu, Satoshi Ukai, Se Joo Kim, Paz Toren, Young Shin Kim, Christian Osiek, Yuji Wada, Przemysław A. Bogacki, Nicola Gervasoni, Mitsuru Kikuchi, Wolfgang Prause, Jussi Virkkala, Tero Hallikainen, Guido Bondolfi, Hanna Putz, Birgitt Wiese, Gerda M. Saletu-Zyhlarz, Takahiro Tsukada, Janusz K. Rybakowski, Hyun Joo Hong, Hinderk M. Emrich, Yasuhiro Kawasaki, Maria Luiza Nunes Mamede Rosa, Wojciech Ł. Dragan, Michèle Schwald, Shunsuke Kawaguchi, Matthias Karst, Alina Borkowska, Peter Neu, Norihiko Fujita, Jean-Michel Aubry, I-Ching Lai, Masato Higashima, Eila Repo-Tiihonen, Gilles Bertschy, Nathaniel Laor, Alexander Saletu, Peter Anderer, Jen-Yeu Chen, Tsutomu Takeda, Masatoshi Takeda, Antti Saastamoinen, Marcus Lira Brandão, Silvia Parapatics, Ying-Chieh Wang, and Eero Huupponen

Subjects
Psychiatry and Mental health, Neuropsychology and Physiological Psychology, Index (economics), Statistics, Subject (documents), Biological Psychiatry, Mathematics
Published
2005
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7. Subject Index Vol. 53, 2006

Author

Junichi Azuma, In Kyoon Lyoo, Jun Li, Hongfen Chang, Satoshi Ukai, Sook-Haeng Joe, Jianjun Gao, Myoung-Jin Choi, H.-G. Weijers, Friedrich-M. Wurst, Ihn-Geun Choi, Urs Hepp, Fuchang Zhang, Gabriella Milos, Norbert Wodarz, Xueqing Qian, Kazuhiro Fukuda, Kenji Nobuhara, Jobst Boening, Marc Walter, Gultekin Tas, Thomas Noll, Taner Güvenir, Ducksun Ahn, Masakiyo Yamamoto, Aba Delsignore, Masatoshi Takeda, Masataka Wakeno, Burcu Cakaloz, Min Soo Lee, Megumi Yamashita, Leen Kim, Zijian Zheng, Tingwei Guo, Seung Hyun Kim, Young-Mee Lee, Jung-Jae Lee, Byung Joo Ham, Shunsuke Kawaguchi, Ryouhei Ishii, Kazuhiro Shinosaki, Jeong-Hyun Park, Kenneth M. Dürsteler-MacFarland, Yoshiteru Takekita, Fatma Varol Tas, Asao Ogawa, Fangli Dang, Tsuyoshi Fukuda, Xiaocai Gao, Woong Cho, Toshihiko Kinoshita, Masaki Kato, Yuka Ikenaga, Wei Qin, In-Kwa Jung, Gerhard A. Wiesbeck, Bernd Kraemer, Yuko Mizuno-Matsumoto, Young Hoon Ko, Xiaoyang Zeng, Meyoung-Kon Kim, Murat Örmen, Guoyin Feng, Toshiki Yoshimine, Qinghe Xing, Juneyoung Lee, Lin He, Norihiko Fujita, Gaku Okugawa, and Ulrich Schnyder

Subjects
Psychiatry and Mental health, Neuropsychology and Physiological Psychology, Index (economics), Statistics, Subject (documents), Biological Psychiatry, Mathematics
Published
2006
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