Selective fatigue in the human motor system

Summary If the form of simple movements as well as the muscles involved are coded by place, it should be possible selectively to fatigue form-specific and muscle-specific neurons, whereby muscle-specific units are supposed to control homologous muscles on both sides of the body. In two experiments both kinds of selective fatigue effects were observed by the use of movements of different forms and with different fingers of both hands. These effects showed up in the variability of movement times only, but not in their mean.