Chaotic characteristic in human hand movement

This paper reveals the chaotic properties of the voluntary single arm and two arms movements in various conditions based on the movement frequency and movement modes (single arm mode, in-phase mode and anti-phase mode). The chaotic analysis of rhythmic forearm movement were performed, and it was confirmed that the chaotic characteristics represented by the correlation dimension and the largest Lyapunov exponents were included in the rhythmic forearm movements. Furthermore, it was clarified that there existed the difference in the values of the Lyapunov exponents and fractal dimensions between right-left forearms and consequently the left forearm movements was more complex than the right forearm movements.