Abstract
The effects of threat of shock on heart rate and motor performance were studied on Ss differing in previously expressed fear of shock. Twenty-four high fear-of-shock (HFS) and an equal number of low fear-of-shock (LFS) Ss were given 15 training trials on a conventional pursuit rotor. Following training one third of the Ss were informed that during subsequent trials shock would be administered if performance fell below training levels, one third were told that shock would be randomly administered, and the remaining third served as a control. No shocks were actually administered. HFS Ss revealed significantly greater heart-rate acceleration and performance impairment, but only under the condition in which Ss were told that receipt of shock would be contingent on prior performance level.
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