Kipling Williams

Who they are

Kipling D. Williams is Distinguished Professor Emeritus of Psychological Sciences at Purdue University. His field is what happens to people when they are ignored, excluded or rejected, and his contribution is as much methodological as theoretical: before Cyberball there was no clean way to assign exclusion at random and watch what it did.

The paradigm was developed with Christopher Cheung and Wilma Choi and first reported in 2000. Participants believe they are playing a simple ball-tossing game over the internet with two or three others, who are in fact controlled by the experimenter. In the first study 1,486 participants from 62 countries took part. The more they were ostracised, the worse they reported feeling, the less control they reported having, and the less of a sense of belonging. The design is deliberately trivial. The other players are not real, participants are often told they are not real, and the whole thing lasts about two minutes.

That triviality is the point and also the limit. Cyberball is a clean instrument precisely because the stakes are nil, which means what it establishes is the sensitivity of the mechanism rather than the size of any real loss. Being frozen out by a team you have worked with for six years is a different event, and it has not been measured this way for the obvious reason that it cannot be randomised.

Williams is the senior author on the 2015 meta-analysis that pooled 120 Cyberball studies and 11,869 participants and found an average effect above d = 1.4, generalising across age, gender, country and every structural variation tested. He is not its first author. That paper is Chris Hartgerink's, and it is routinely attributed to Williams because his is the name attached to the field. The correct citation names Hartgerink first.

Key papers

Williams, K. D., Cheung, C. K. T., & Choi, W. (2000), "Cyberostracism: Effects of Being Ignored Over the Internet," Journal of Personality and Social Psychology, 79(5), 748-762. The paper that introduced the paradigm, with 1,486 participants from 62 countries in its first study.

Williams, K. D. (2007), "Ostracism," Annual Review of Psychology, 58, 425-452. His synthesis of the field: exclusion signals a threat, and reflexive detection of it in the form of pain and distress is adaptive.

Hartgerink, C. H. J., van Beest, I., Wicherts, J. M., & Williams, K. D. (2015), "The Ordinal Effects of Ostracism: A Meta-Analysis of 120 Cyberball Studies," PLOS ONE, 10(5), e0127002. Williams is fourth and senior author. Hartgerink is first.

Key ideas

Exclusion can be assigned at random, and Cyberball is how. The methodological move is what opened the field.

Being ignored by software you know is software still registers, and it registers fast.

The average Cyberball effect is above d = 1.4 and holds across age, gender, country and structural variation.

The paradigm measures the sensitivity of the mechanism, not the magnitude of real exclusion, and Williams has been clear about what it is for.

A group with no capacity to exclude has no capacity to reassure. The exclusion effect and the reassurance of membership are one instrument seen from either side of the door.

Concepts on this site

Ostracism

Need to Belong

Conformity

Find them elsewhere

Purdue directory page confirmed, and the Scholar profile is verified at psych.purdue.edu and names his Distinguished Professorship. No social accounts could be confirmed as his

Checked 2026-09-10. Handles and affiliations go out of date, so treat this block as a snapshot rather than a standing fact.

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