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Human observers often experience strongly negative impressions of human-like objects falling within a particular range of visual similarity to real humans ('uncanny valley' phenomenon). We hypothesize...d that negative impressions in the uncanny valley phenomenon are related to a difficulty in object categorization. We produced stimulus images by morphing each two of real, stuffed and cartoon human face images (Experiment 1). Observers were asked to categorize each of these images as either category and evaluated the likability of it. The results revealed that the longest latency, the highest ambiguity in categorization, and the lowest likability score co-occurred at consistent morphing rates. Similar results were obtained even when we employed stimulus images that were created by morphing each two of real, stuffed and cartoon dog images (Experiment 2). However, the effect of categorization difficulty on evaluation was weak when two real human faces were morphed (Experiment 3). These results suggest that the difficulty in categorizing an object as either of dissimilar categories is linked to negative evaluation regardless of whether the object is human-related or not.続きを見る
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