Abstract
Rats were given shock-escape training in a 4 ft runway, then divided into 3 groups of 10 Ss each. During extinction one group received 1 ft of shock immediately after leaving the start box, a second group was shocked in the last 1 ft section of the alley, and a control group was never shocked. The immediate-shock group was found to be more resistant to extinction, followed successively by the delayed-shock group and the no-shock group.
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