Abstract
When performing limb movements, motor planning signals are used to attenuate sensory signals to allow for differentiation between self- and externally-imposed cutaneous sensations. It has been previously shown that crossing the arms increases error rates of spatially-localized temporal order judgments (TOJs). We investigated whether or not the amplitude of the movement affected the ability to perform a temporal order judgment task. We found that during bilateral movements, the hand generating larger amplitude movements led to increased error rate relative to the shorter movements and stationary conditions. By contrast, we observed no difference between error rates for either hand during symmetrical movements. Taken together, this implies that some aspect of planning movements which vary in amplitude interacts with the decision-making processing associated with judgments of temporal order.
