# McCollough effect

> English word · Noun

## Definitions
1. A phenomenon of human visual perception in which colorless gratings appear colored contingent on the orientation of the gratings.

## Etymology
Named after American psychologist Celeste McCollough who discovered the effect in 1965.

## Source
Compiled from Wiktionary via kaikki.org (CC BY-SA). Data vintage: 2026-05-06.
Canonical page: https://plainspell.com/en/word/mccollough-effect