Rats (N=69) were trained in a runway under 0-, 10-, and 20-sec. delays and extinguished with 0-, 10-, 20-sec. delay-box confinements using one trial/day in each stage of the experiment. Duration of delay in training was inversely related to running speed in acquisition and in extinction. Duration of confinement in extinction was inversely related to running speed in extinction. Increases in delay from training to extinction led to faster extinction; decreases in delay to slower extinction.
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