Neurophysiological sand pathophysiological studies of the human brain function of sensory processing

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During the term of the research (2002-2003), I investigated the sensory processing in the human brain, using evoked potential and evoked magnetic field techniques. For the somatosensory processing, we found the brain could process high frequency stimulation applied on the peripheral up to 1000Hz, although the subject could not recognized each high frequent stimulation at all. The ability to respond to high frequency stimulation was a basic function for the temporal discrimination, which is one of the somesthetic discrimination of human. I studied the temporal discrimination on various part body and also pathological changes by aging. Similarly to the somatosensory system, I investigated the visual function and its temporal resolution. Giving a very short visual stimulus, the brain response for the subliminal stimulation was investigated. I concluded that the subliminal could affect the brain response to the supraliminal visual stimulation. Both in the somatosensory and visual processes, brain responses to the subliminal stimulation might be important and might affect the cognition and behavior after the stimulation.