Abstract
The effect of lifting a 7.5-lb. weight during rest intervals on pursuit rotor tracking was compared with no-lift controls and a condition in which Ss lifted only the stylus. Two weights of stylus were also used but this factor had no over-all effect on time on target (TOT) scores. Stylus weight did interact significantly with sex of Ss, the women showing lower TOT scores with the heavier stylus weight. The lifting of either the 7.5-lb. weight or the stylus alone produced significantly lower TOT scores than the no-lift conditions. The weight contrast effect induced by lifting the 7.5-lb. weight produced a short term improvement over the stylus-lifting condition but also a compensating inhibitory effect in later trials.
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