Atsushi Kodabashi

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OBJECTIVE We studied differences in the spatiotemporal dynamics of cortical oscillation across brain regions of patients with schizophrenia and normal subjects during the auditory oddball task using magnetoencephalography (MEG) and electroencephalography (EEG). METHODS Ten right-handed male schizophrenia patients were studied. We used a newly developed(More)
BACKGROUND We studied the imaginary coherence (IC) of gamma frequency oscillations between brain regions of male schizophrenia patients during an auditory oddball task using magnetoencephalography (MEG) and electroencephalography (EEG). METHODS Subjects were 10 right-handed male schizophrenia patients, evaluated by the positive and negative symptom scale(More)
In recent cognitive neuroscience, many studies have been conducted on the human working memory. However, the temporal activities in the working memory-related brain regions are not clear yet. To elucidate the temporal activities of the working memory-related brain regions, we studied the EEG P300 activities during n-back tasks with a source analysis. We(More)
PURPOSE The Wada test has been the gold standard for determining hemispheric language dominance (HLD) in the presurgical evaluation of patients scheduled for neurosurgical procedures. As it poses inherent risks associated with intra-arterial catheter techniques and as it occasionally fails to indicate language dominance, an alternative reliable test is(More)
We studied differences in imaginary coherence (IC) of the gamma band between brain regions of female schizophrenia patients during the auditory oddball task using magnetoencephalography (MEG). Subjects were 12 right-handed female schizophrenia patients, who were evaluated by the Positive and Negative Syndrome Scales (PANSS). Functional connectivity during(More)
We studied sex-related differences in gamma oscillation during an auditory oddball task, using magnetoencephalography and electroencephalography assessment of imaginary coherence (IC). We obtained a statistical source map of event-related desynchronization (ERD) / event-related synchronization (ERS), and compared females and males regarding ERD / ERS. Based(More)
We investigated the time course of cortical activity in the brain related to cold epidermal touch stimulation at 4 degree Celsius and touch stimulation at a normal temperature of 14 degree Celsius to the palm of the hand in 20 normal human subjects (average age of 29.1plusmn6.0 years), using magneto-encephalography (MEG). The time course of cortical(More)
The aim of this study is to consider the appropriate element of the stimulation for subjects by observation of fMRI. The stimulus is used for suggesting the direction to the people. In this study, we have attempted to observe the brain activation during different kind of visual stimulus such as doll (teddy bear), arrow and Japanese character (Hiragana), and(More)
Cerebral nerve activity estimated by means of magnetoencephalography (MEG) is usually evaluated by fusion with anatomical images such as MRI, X-ray CT. Therefore, in order to diagnose using MEG measurement results, it is very important to consider not only accuracy of MEG source estimation but also total accuracy including fusion with these anatomical(More)
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