Abstract
This study investigated the effects of 2 levels of time constraint upon task completion performance and mean heart-rate changes during testing. The pursuit-tracking task involved a cathode ray oscilloscope in closed loop with a control stick. The success criterion was 10 target lock-ons within predetermined time limits. The time limits were 100%, 60%, and 40% of each of 20 Ss' self-paced time requirements at the end of training. The results indicate that task-completion performance did not degrade with time constraint at the levels investigated. Mean change in heart rate was significantly greater on those tasks where success was in doubt until the end than on tasks where success or failure was a likely conclusion.
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