# Are red, yellow, green, and blue perceptual categories?

> Research article (Vision Research, 2018) · cited 34× · AI/ML

**Wikidata**: [openalex:W2801589932](https://www.wikidata.org/wiki/openalex:W2801589932)  
**Source**: https://4ort.xyz/entity/are-red-yellow-green-and-blue-perceptual-categories