Contrast Effect
Judging things based on comparison to adjacent options
What is it?
The contrast effect is a perceptual phenomenon where our evaluation of something is altered by comparison to something recently experienced. A room-temperature drink feels cold after holding ice, and warm after holding a hot cup. This effect extends from physical perception to judgments about people, products, and situations. In hiring, a mediocre candidate seems excellent after a series of weak ones, and an excellent candidate may seem merely average after an outstanding one. Real estate agents exploit this by showing overpriced or undesirable properties first to make the target property seem like a bargain. Salary negotiations are affected by the first number mentioned. The contrast effect is related to but distinct from anchoring—while anchoring involves a reference point for estimation, contrast affects qualitative perception. The effect means evaluations are never truly objective; they're always relative to recent experiences. This creates problems when sequence affects judgment (interview order, presentation order). Mitigating the contrast effect requires evaluating options against absolute criteria rather than each other, randomizing sequences when possible, building in breaks between evaluations, and being aware that recent experiences color current perceptions.
Example
A mediocre candidate seeming excellent after interviewing several weak ones. A house seeming like a bargain after viewing overpriced ones. Food tasting bland after spicy dishes.
References
Sherif, M., Taub, D., & Hovland, C. I. (1958). Assimilation and Contrast Effects of Anchoring Stimuli on Judgments. Journal of Experimental Psychology, 55(2), 150-155.
Kenrick, D. T., & Gutierres, S. E. (1980). Contrast Effects and Judgments of Physical Attractiveness: When Beauty Becomes a Social Problem. Journal of Personality and Social Psychology, 38(1), 131-140.
How to Prevent It
Am I evaluating this on its own merits?
Would I rate this differently in a different sequence?
Is my judgment affected by what I just experienced?
What would I think if this were the first thing I saw?
Am I comparing to an extreme example that skews my perception?
Use absolute criteria, not just comparisons.
Randomize the order of evaluation when possible.
Take breaks between evaluations to reset perspective.
Score options against predetermined benchmarks.
Use calibration sets to anchor your judgments consistently.