In visual metaphor processing, one object, the target, is compared to and understood in terms of another object, the source. Several studies suggest that perceptual similarity between two objects enhances a conceptual link between the two. However, little is known about how perceptual features contribute to the establishment of this link. In the present experiment we investigated the processing of the four possible combinations of conceptually and perceptually similar picture pairs using a same-different task. In order to determine whether particular processes are bound to a particular time range, we manipulated the delay between the two successively presented pictures. We expected perceptual processing effects at a short delay and conceptual processing effects at a longer delay. We did not find evidence for this expectation. However, the results did show that (i) it took participants longer to give a 'different' response if two objects shared perceptual features than when they did not; (ii) this presence of perceptual similarity also resulted in more response errors; and (iii) if objects shared only perceptual features, participants in the long delay condition produced more erroneous responses than the participants in the short delay condition did. These results are discussed in light of metaphor processing models.
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