Subjects decided if two letter pairs, presented simultaneously, had the same names. Letter case and letter colour were logically irrelevant to the classification, however classification responses were slower when the two letter pairs were in different colours (red and green) than when they were in the same colour, or if one of the pairs were white. If one of the pairs were white, the colour of the other pair did not affect decision latencies. This result was interpreted as necessary, but not sufficient, evidence for the hypothesis that a “colourless image” may be a white image.
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