Similarity Grouping and Repetition Blindness are Both Influenced by Attention.

This ANOVA showed a significant main effect for the attentionally relevant stimulus attribute condition in the letter identification task ( F 1,20 = 24.906, p < 0.001) whereas both the main effect of the attentionally irrelevant stimulus attribute condition and the interaction effect failed to reach significance ( F 1,20 = 0.141, p = 0.711 and F 1,20 = 0.569, p = 0.460 respectively).

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Thus, combined with the results from Experiment 1, which showed a highly significant effect of repetition blindness during an essentially identical letter identification task, the data do not necessarily contradict the notion that in the letter identification task repetition blindness depends on attentional relevance.

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