VARIABILITY ASSOCIATED WITH CYCLIC CHANGING OF TARGET FORCE IN RHYTHMIC SERIAL RESPONDING

Rhythmic performance involving motor activity may be marked by pattern ing in terms of stress as well as time. We show that, in the productio n of sequences of brief isometric force impulses, a simple stress patt ern involving alternating target force levels is associated with great er variability in peak force than when the sequence contains responses at a single target level of force.