In a positive contrast effect, a decrease in the rate of reinforcement on one component of a multiple schedule is followed by an increase in the rate of response on the other component.
The contrast effect is a cognitive bias that distorts our perception of something when we compare it to something else, by enhancing the differences between them. This comparison can be either explicit or implicit, simultaneous or at separate points in time, and can apply to various traits, ranging from physical qualities, such as color and taste, to more abstract qualities, such as price and attractiveness
In some cases, the contrast effect is categorized as belonging to one of two main types:
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