Debi Roberson studied color categories, language and recognition memory across cultural groups. Naming and recognition comparisons, together with response-bias controls, test how category boundaries relate to performance. The work separates a language-associated category effect from a claim that observers literally cannot discriminate colors on the same side of a named boundary. [ref]
Color categories are not universal: Replications and new evidence from a stone-age culture by Debi Roberson and others. 2000, naming, recognition and category-boundary comparisons
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