Comparison among various movement tasks of cerebral motor potential preceding voluntary movement

We examined the relationship between the movement potential (MP) and various movement tasks. We found that the MP amplitudes were the highest for the hand grip movement among various movement tasks. Furthermore, the present results indicated that a significant correlation was found between the MP latencies and prereaction time. The present experiments showed that there were changes in the latency and amplitude of the MP in rapid movements from a slightly sustained contraction and in fast reaction movements. Therefore, we noted that the MP amplitudes and latencies change corresponding to the type of movement tasks. Accordingly, it may be concluded that there is a close relationship between the MP and central motor output, namely physical factors (force and speed).