Abstract
A study was conducted to ascertain the effects of practice and variations in target size on the efficiency with with Ss perform a rotary tracking task. Since neuro-muscular control increased with each day of practice without a concomitant increase in effort, Ss obviously increased in tracking efficiency. Since the performance efficiency measure takes into account the covariations between performance and effort, it generates more stable functions having greater generalization potential when plotted as a function of practice or task difficulty than do separate plots of performance and effort.

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