Compared to What? The Power of the Contrast Effect

Q: What is the contrast effect in psychology?

The contrast effect is a psychological phenomenon in which our perception of something changes depending on what we experience or compare it with immediately before. Rather than evaluating things independently, our brains use surrounding information as a reference point to determine value, quality, attractiveness, and even performance. The contrast effect demonstrates how strongly context shapes perception. Our brains constantly make comparisons, often without our conscious awareness, and those comparisons can influence everything from purchasing decisions to how we evaluate other people.

Q: Is the contrast effect a cognitive bias?

Yes. The contrast effect is commonly considered a cognitive bias because it can systematically distort our judgments by making them dependent on comparisons rather than objective criteria. Instead of evaluating something on its own merits, we unconsciously allow other experiences or options to influence our perceptions. This mental shortcut can be useful because comparisons help us make quick decisions. However, it can also lead to inaccurate judgments, particularly when evaluating prices, job candidates, employee performance, or personal achievements.

Q: What is an example of the contrast effect?

A classic example of the contrast effect in everyday life happens when shopping for an expensive item. Imagine looking at a $2,000 sofa. After seeing a similar sofa priced at $5,000, the $2,000 option suddenly feels like a bargain. The sofa hasn't changed, but your perception of its value has. The same principle influences how we judge people. A job candidate may seem exceptionally qualified after interviewing several weaker candidates, yet appear less impressive when interviewed immediately after an outstanding candidate. In both situations, the brain uses comparison to interpret information. The contrast effect reminds us that what we experience first can significantly influence how we perceive what comes next.

Q: What is the difference between the contrast effect and anchoring?

The contrast effect and anchoring bias both influence judgment, but they operate in different ways. The contrast effect occurs when our perception of something shifts because we're comparing it with another experience or option. For example, a $100 bottle of wine may seem inexpensive when it's displayed next to a $300 bottle. Anchoring bias occurs when we rely too heavily on an initial piece of information, often a number, when making subsequent judgments. For example, if a jacket is originally priced at $400 and marked down to $200, the original price can become a mental anchor that makes the sale price seem especially attractive. The distinction is subtle but important. Contrast changes how we perceive differences between things, while anchoring influences the reference point we use to make judgments. Both demonstrate that our decisions are shaped by context, often more than we realize.

Dr. Melissa Hughes

Jul 8, 2025

5 min read

Updated: Oct 23

Have you ever noticed that an overpriced product feels reasonably priced when displayed next to a more expensive product? Or that you feel less confident when everyone around you seems to be a rockstar?

The contrast effect is a cognitive bias where our judgment of something shifts based on what we just saw or what sits beside it. A $60 entrée looks reasonable next to a $120 one. A solid job candidate seems weaker after an outstanding one. The comparison, not the thing itself, drives the verdict.

Understanding the Contrast Effect

The contrast effect was first noted by the 17th-century philosopher John Locke. He observed that lukewarm water can feel hot or cold, depending on whether the hand touching it was previously in hot or cold water. This phenomenon has been studied extensively in various fields, including marketing, education, and social behaviors.

Examples of the Contrast Effect

Sweet drinks taste sweeter if consumed right after something less sweet, compared to when consumed after something sweeter.
People often feel more attractive after looking at pictures of those who are relatively unattractive.
Students may feel less confident in their academic abilities when surrounded by high-performing peers.

(I learned the colored cube trick from Dan Ariely’s 2008 TED Talk, Are we in control of our own decisions?, which is totally worth the watch!)

Perceptual Contrast

Visual perception is not the only aspect that the contrast effect can skew. A teacher might grade a mediocre essay more harshly after reading an outstanding one. A 5’10” tall man standing next to a 6’6” man will seem short, but he appears tall next to a 5’0” man. A reduced price looks much cheaper than it actually is, simply because the original price tag is still visible.

Imagine you just decided to buy a new suit. A savvy salesperson might show you an expensive tie that complements the suit. Compared to the suit's price, the tie does not seem too expensive. However, without that comparison, you might not even consider buying such an expensive tie.

The Contrast Effect in Hiring

In recruiting and hiring, the contrast effect operates similarly. It’s human nature to assess candidates in comparison to others rather than evaluating each candidate based on their skills, expertise, and experience. The brain, in its attempt to efficiently process information, judges each candidate relative to those evaluated before and after. As a result, weaker candidates may appear stronger than they truly are, while the most qualified individual might be overlooked.

The Checker Shadow Illusion

The checker shadow illusion is another example published by Edward H. Adelson, a professor at MIT, in 1995. The image depicts a checkerboard with light and dark squares, partially shadowed by another object. The optical illusion suggests that the area labeled A appears darker than the area labeled B. However, within the context of the two-dimensional image, they are identical.

Positive vs. Negative Contrast Effect

Positive Contrast Effects

A positive contrast effect occurs when something is perceived as better than it would usually be perceived because it’s compared to something worse. For example, people often feel more physically attractive after viewing pictures of people who are relatively unattractive.

Negative Contrast Effects

A negative contrast effect occurs when something is perceived as worse than it would typically be perceived because it’s compared to something better. Students often feel less confident in their abilities when they are in a class with high-performing students. This phenomenon is related to the big-fish-little-pond effect (BFLPE).

The Contrast Effect vs. Anchoring Bias

The contrast effect and anchoring bias both influence judgment, but they operate in different ways. The contrast effect occurs when our perception of something shifts because we're comparing it with another experience or option. For example, a $100 bottle of wine may seem inexpensive when it's displayed next to a $300 bottle.

Anchoring bias occurs when we rely too heavily on an initial piece of information, often a number, when making subsequent judgments. For example, if a jacket is originally priced at $400 and marked down to $200, the original price can become a mental anchor that makes the sale price seem especially attractive.

The distinction is subtle but important. Contrast changes how we perceive differences between things, while anchoring influences the reference point we use to make judgments. Both demonstrate that our decisions are shaped by context, often more than we realize.

How to Avoid the Contrast Effect

To reduce the influence of the contrast effect, you must first identify it at work and then break the connection between what you’re trying to evaluate and the comparisons against it.

Here are a few strategies to help you:

Increase the time and space between options. Don’t evaluate one choice immediately after another. Space them out to allow for clearer judgment.
Add more options. A wider variety of choices can decrease the contrast you notice between fewer options.
Identify the most important features, benefits, or characteristics to you. Clearly defining these aspects makes irrelevant factors less compelling.

Frequently Asked Questions About the Contrast Effect

What is the contrast effect in psychology?

The contrast effect is a psychological phenomenon in which our perception of something changes depending on what we experience or compare it with immediately before. Rather than evaluating things independently, our brains use surrounding information as a reference point to determine value, quality, attractiveness, and even performance.

The contrast effect demonstrates how strongly context shapes perception. Our brains constantly make comparisons, often without our conscious awareness, and those comparisons can influence everything from purchasing decisions to how we evaluate other people.

Is the contrast effect a cognitive bias?

Yes. The contrast effect is commonly considered a cognitive bias because it can systematically distort our judgments by making them dependent on comparisons rather than objective criteria. Instead of evaluating something on its own merits, we unconsciously allow other experiences or options to influence our perceptions.

This mental shortcut can be useful because comparisons help us make quick decisions. However, it can also lead to inaccurate judgments, particularly when evaluating prices, job candidates, employee performance, or personal achievements.

What is an example of the contrast effect?

A classic example of the contrast effect in everyday life happens when shopping for an expensive item. Imagine looking at a $2,000 sofa. After seeing a similar sofa priced at $5,000, the $2,000 option suddenly feels like a bargain. The sofa hasn't changed, but your perception of its value has.

The same principle influences how we judge people. A job candidate may seem exceptionally qualified after interviewing several weaker candidates, yet appear less impressive when interviewed immediately after an outstanding candidate.

In both situations, the brain uses comparison to interpret information. The contrast effect reminds us that what we experience first can significantly influence how we perceive what comes next.