CNP is affected by the chewing strength —Pattern of the appearance of masticatory masseter electric discharge—

To determine whether cortical negative potential (hereafter referred to as CNP), which was recorded from the scalp (sites: T3, CZ and T4), preceding the right-side chewing, is affected by the pattern of the appearance of masseter electric discharge, difference of strong and weak chewing with CNP appearance were compared. In the case of strong chewing, CNP appeared early, and its amplitude increased as compared with the results in the case of weak chewing. From this result, we related that CNP amplitude is related to the chewing output.