線画オブジェクトの認知過程 : 検出・識別・同定・カテゴリー化に関連する形態情報の比較

概要

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Object recognition involves perceptual decisions, such as detection, discrimination, identification and categorization. We investigated which stimulus' properties are involved in these decisions using stimuli from Snodgrass and Vanderwart (1980) modified by random-noise. Each experiment examined a different perceptual decision. In Experiment 1, observers performed a detection task, and detection thresholds were measured. In Experiments 2, 3 and 4, discrimination, identification and categorization tasks were performed, respectively, and the accuracy and RTs were measured. The correlations between measurements (i.e., the detection thresholds, accuracy and RTs) and object variables, such as the number of pixels, the degree of circularity and visual complexity, indicated that detection is correlated with the perception of the local edge. Discrimination decisions involved the comparison of salient parts of the objects, and identification and categorization decisions involved a wide range of visual processing (i.e., the perception of the local edge, visual complexity and image agreement).
2011-09-30