negative contrast effect

negative contrast effect

A term of art used in operant conditioning referring to the decline in response rate when the size of a reinforcer (reward) is reduced to a rate below that seen in subjects who had been receiving a smaller reinforcers ab initio.
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Successive negative contrast effect in instrumental runway behaviour: A study with Roman high- (RHA) and Roman low- (RLA) avoidance rats.
Successive negative contrast effect in one-way avoidance learning in female roman rats.
In no case did doing so lead to a negative contrast effect in responding for 1% sucrose in the first component.
But it did not produce a systematic negative contrast effect.
In short, although it remains possible that food-pellet reinforcement may potentially produce a negative contrast effect in responding for 1% sucrose, the present study found little evidence to indicate under what conditions this outcome would be observed.
That is, both deprived and nondeprived subjects should display an enduring negative contrast effect, such as that obtained with nondeprived subjects in the present study.
Such decrements in responding have been termed negative contrast effects (NCE).
Although negative contrast effects in consummatory behavior are typically demonstrated using food-deprived subjects (Flaherty, 1982; Flaherty, Becker, & Checke, 1983; Flaherty & Largen, 1975.
Subjects in a currently nondeprived state should respond to the hedonic value of the solutions and display enduring and recurring positive and negative contrast effects characteristic of nondeprived subjects, regardless of their initial deprivation condition.
Although the mean weight of initially deprived subjects remained significantly below that of initially nondeprived subjects throughout Phase 2, the pattern of negative contrast effects was characteristic of the current deprivation condition.
The partial reinforcement effect and the successive negative contrast effect were among these results.