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Abstract:
Abstract: Isometric finger movements requiring either 400g or
1200g of force were used to examine the effect of increased motor
load on timing performance. Subjects performed rhythmic
reproductions with and without a pacing signal at 9 interstimulus
intervals (325 - 1210 ms). Preliminary analyses show similar
overall levels of variability between load conditions in both paced
and unpaced tapping. Changes in variability with rate of
reproduction indicate a mid-range (500 - 700 ms) difference between
paced versus unpaced tapping under the 1200g, but not the 400g,
force requirement. This disruption in timing may reflect temporal
constraints of corrective processes in the task when increased
motor effort is required.
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