Force of responding during extinction as a function of force requirement during conditioning.

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Abstract
Rats were conditioned to press a bar to obtain food. Half of the animals were further conditioned with a 50-g force, half with a 100-g force required to depress the bar. All animals were then extinguished by omitting food after bar presses. Half of the animals were extinguished with a 50-g force and half with a 100-g force required to depress the bar. During extinction, animals conditioned with 100-g force requirement made more complete bar presses than the animals conditioned with a 50-g force requirement; animals conditioned with 50-g made more incomplete or partial bar presses than animals conditioned with a 100-g force requirement. These findings support the hypothesis that forcefulness of responding during extinction is a positive function of force requirement during conditioning.
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