The mere exposure effect on amodal completion for partly occluded stimuli

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  • 部分遮蔽刺激を用いたアモーダル補完時の単純接触効果の検討
  • ブブン シャヘイ シゲキ オ モチイタ アモーダル ホカンジ ノ タンジュン セッショク コウカ ノ ケントウ

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The mere exposure effect (MEE) refers to the phenomenon where repeated exposure to a stimulus results in an increased liking for that stimulus. When a shape is partly occluded, observers usually perceive the contours to be continuous (i.e., amodally completed) behind the occluders. This study investigates whether the MEE would occur primarily for amodally completed shapes (i.e., perceived shapes) or for physically input shapes. We used novel contour shapes as the stimuli, which were overlaid with square-wave grating occluders (i.e., stripes) of various widths. During the exposure phase of the experiments, 50%-occluded shapes were repeatedly presented to the observers. During the rating phase, the observers rated the likeability of the same 50%-occluded stimuli, non-occluded stimuli, and stimuli 50%-occluded by gratings that were half-cycle shifted. The results of three experiments showed a significant MEE only for the 50%-occluded stimuli that were presented exactly the same at both the exposure and the rating phases. Another experiment confirmed that these stimuli were indeed perceived as amodally completed. These findings indicate that the MEE for partly occluded stimuli occurs primarily to physically input shapes, not to perceived shapes.

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