Abstract
Two different starting procedures, drop box vs. guillotine door, were used in giving 36 male rats 20 massed shock-escape trials in a straight runway. On subsequent trials, the animals encountered no shock at all, shock punishment in the middle 2 ft of the 4-ft alley, or shock for.5 sec immediately after entering the goalbox. The guillotine-door procedure produced faster running in extinction, alley punishment facilitated responding, and goal punishment sup- pressed responding. Results were interpreted in terms of stimulus-directive effects, as modified by massing vs. spacing trials.
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