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キーワード:
Brain-computer interfacing; Electroencephalography; Event-related desynchronization; Electromyography; Intention; Motor imagery; Quasi-movements; Repetition suppression; Sensorimotor cortex
要旨:
‘Repetition suppression’ (RS) denotes the decrease of neural responses to repeated external sensory stimuli. Weshowed that RS can be also triggered by internal processes alone. When individuals perform repetitive covert movements, that is, motor imagery or quasi-movements, both of which are associated with pericentral cortical activity without muscle activations, there was asignificant recovery of electroencephalographic oscillations over sensorimotor cortices back to resting baseline level. After 58 s of task performance only 20% of[alpha]and 5% of [beta] suppressions remained (overt movements: 34% remaining in [alpha], complete recovery in [beta]). This result suggests that various, possibly all, repeated cerebral activations are associated with RS, presumably reflecting the adaptation to stereotyped activation in neuralnetworks.
