Contrast Effect

What is the Contrast Effect?

A contrast effect occurs when a judgment shifts away from a comparison context. An item can seem smaller, worse or less attractive alongside high-valued examples, or larger, better or more attractive alongside low-valued ones.

Parducci’s range-frequency model (1965) explains how category judgments depend on the range and distribution of stimuli used as a reference. It shows why the same target can receive different ratings in different contexts. For example, a moderately priced item may seem expensive beside cheap alternatives and inexpensive beside costly ones; its own price has not changed.

Contrast is not simply any effect of context. Assimilation shifts a judgment toward its context. A relative comparison can also be appropriate when the task is explicitly comparative. Judging an item alone does not guarantee a context-free or more accurate assessment; fixed criteria can help make the intended comparison clear.