Time Evolution of Asynchronous Value in Synchronization Tapping Task
Tomoaki Komatsu, Yoshihiro Miyake · Transactions of the Society of Instrument and Control Engineers · 2005
This paper discusses a time-series development of synchronization error (SE) fluctuation in the synchronization tapping task which requires anticipation of action timing. The error called “Negative Asynchrony” is well known in the sensory-motor coupling. This asynchronous means motion timings precede the cyclic onset of stimuli. With the use of power spectrum, we had already analyzed this phenomenon and reported two features of asynchronous. In power spectrum, one has self-similarity of power-law relationship. The other has periodicity with significant power peak. However, in such previous researche, the spectrum analysis is applied under a premise that the SE waveform is constant. In this report, we assumed that the asynchronous displacement has temporal structure. As a result of the DFA and the analyzing time evolution of power spectrum, we discovered new structures in its time-series. One has fairly self-similarity and high (about 1/f0.9∼0.2) fluctuation with regard to interval of pacing stimuli. The other has longstanding, for several minutes, periodicity with a cycle of same frequency. Additionally, we found dynamic relationships among such structures of time evolution.