Proprioception and the timing of motor responses.

Two hypotheses that relate motor response timing to proprioceptive feedback are presented, along with specific predictions. The input hypothesis states that the subject uses the inflow of proprioceptive feedback from an earlier portion of a movement sequence to cue the timing of a later portion, and considerable evidence was found to support this point of view. The Adams and Creamer decay hypothesis states that the subject uses the decay of proprioceptive feedback in short-term memory to cue the timing of a latter movement, and only recently has clear support for this view been provided. Finally, there was the possibility that feedback is not used at all, with the timing of the various sequences being programmed.