Electromyographic and motor cortical responses to imposed displacements of the cat elbow: disparities and homologies with those of the primate wrist

The present "loop analysis" study was undertaken to determine the extent to which the segmented electromyographic (EMG) responses of cat triceps brachii to imposed elbow displacements can be used as a model for those occurring in primate wrist musculature under similar input conditions, since previous workers have assumed homology between the two systems. To this end, the response properties of the EMG peaks and the range of latencies available to a "transcortical loop" were determined in the cat and compared with previous findings from primates.