Abstract
The purpose of this research is to make the factor of progress of performance technology including the consciousness of the rhythm clear from the difference in brain activity. An experiment cooperator's being spontaneous or the brain activity at the time of performing the natural handclap united with the atmosphere of the musical piece and the handclap specified by the experimenter side was measured with optical topography equipment to the musical piece. Doing a result and voluntary clapping tended for the activation of the brain activity to be seen from directed clapping.
