Interaction of top-down and bottom-up processing in feature-defined multiple targets search tasks

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  • 複数目標探索課題によるトップダウン,およびボトムアップ処理特性の検討
  • フクスウ モクヒョウ タンサク カダイ ニ ヨル トップダウン オヨビ ボトムアップ ショリ トクセイ ノ ケントウ

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Abstract

The effect of top-down information on modulation of bottom-up activity in feature search was examined using three modified feature search tasks; target detection, target discrimination, and homogeneity judgment. Top-down information on a target was assumed to be varied with the task. Efficiency of bottom-up information was manipulated by varying the number of targets in a display, which ranged from none to all. Results from the target detection task (Experiment 1) showed that reaction time (RT) for target (s) in one target condition was longer than that in multiple target conditions, suggesting that a feature singleton is not necessarily one of the most useful bottom-up information for visual search. RT as a function of the number of targets in a display varied with the task. When participants were asked to discriminate an attribute of targets (Experiment 3), RT was linearly decreased. When homogeneity of each display was judged (Experiment 2), RT showed U-shape function. These results suggest that top-down processing is involved in feature search and that weighting of it depends on the task.

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