Abstract
Three subjects practiced accurate, fast
elbow flexions of 54 ~ to a 3 ~ wide target. Movements of 36 ~ , 54
~ and 72 ~ were then tested. Comparison over the three distances
showed that the normally monotonic relationship between movement
distance and movement time is alterable by specific training. Subjects
learn to go faster over the practiced distance by refining their
neural commands to the muscles. The benefits of practice only partially
transfer to other distances. We conclude that many of the relationships
seen among movement variables in simple tasks are plastic in nature
and affected by prior experience.
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