Translation models of the Stroop effect predict inhibition when the relevant stimulus type does not match the response type, but a lack of inhibition when it matches. All 4 combinations of relevant stimulus type (color or word) and response type (color or word) were evaluated at several stimulus onset asynchronies (SOAs) in a button-pressing version of the Stroop task to assess this prediction. Inhibition was greatest when the relevant stimulus type did not match the response type. However, in contrast to predictions of translation models, color and word responses produced different patterns of inhibition and facilitation over SOA, implying differences in the word-to-color and color-to-word translation mechanisms, and inhibition was obtained in both of the color-response tasks. A modification of the translation model is proposed that incorporates a translation mechanism and accommodates special characteristics of word processing.
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