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In two experiments amodal completion of partly occluded shapes was investigated by recording eye movements in a directed visual-search task. Participants searched arrays of shapes in a prescribed order for target figures that could partly be occluded. Longer gaze durations were found on occlusion patterns than on truncated control patterns for targets but not for non-targets. This effect of occlusion was restricted to a subset of the stimuli. A second experiment was carried out to establish whether this restriction resulted from structural properties of the stimuli or their familiarity. Occlusion patterns in this experiment were ambiguous with respect to structure, allowing both local and global completions. One of the completions was always less familiar than the other. The results showed longer gazes only for the less familiar completions, irrespective of whether they were local or global. 相似文献
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Reserve price and competing bids: Reference points for product evaluations in online auctions?
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With an increasing number of products sold in online auctions, the effect of reference points on consumers' product valuations has received much attention in the literature. Two potentially relevant factors affecting bidders' preferences are the sellers' reserve price and the competing bids by other bidders. The current evidence regarding these reference points is mixed. We argue that a focus on studying bids prevents a clear identification of reference point effects. Directly observing product valuations, in two experiments, we find that willingness to pay in online auctions is affected by both reserve prices and competing bids, supporting the constructed values paradigm. Copyright © 2015 John Wiley & Sons, Ltd. 相似文献
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