Effects of Repetitive Transcranial Magnetic Stimulation on Perceptual Reversal

概要

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Superior parietal lobule, which relates to spatial attention and shifts of spatial attention, is believed to play a key role in perceptual reversal. As an active approach to investigate brain function, rTMS can make artificial excitatory or inhibitory activation in a local region of brain, and when compared to the passive approach (normal brain activation), rTMS provides a flexible and controllable method to investigate the function of the interested region. In this study, to investigate the function of the right superior parietal lobule during perceptual reversal, a 1 Hz 240-pulse biphasic rTMS at 90% of resting motor threshold was applied over the right superior parietal lobule and right posterior temporal lobe, respectively. As a control, a No-TMS Trial was also conducted. The inter-reversal time of perceptual reversals between these three conditions were compared. It was found that compared to the other two conditions, rTMS applied over right posterior temporal lobe caused longer inter-reversal time. This result suggests that the right superior parietal lobule plays a critical role in perceptual reversal. Moreover, it suggests that 1 Hz 240-pulse rTMS causes a suppression effect on perceptual reversal.
社団法人日本磁気学会の論文
2008-07-01