Behavioral contrast refers to a pattern of responding in which an organism seems to evaluate a reward relative to other rewards that are available or that have been available recently. For example, an animal might respond only weakly to a reward of two pellets if it recently received a reward of five pellets for some other response.
Other /More definition:
Behavioral contrast refers to a change in the rate of reinforcement on one component of a multiple schedule produces an opposite change in the rate of response on another component.

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