지각적으로 유사한 다중 시각탐색 과제 간 표적 출현확률의 불일치가 초래하는 의사결정 기준의 전이현상

초록

In our real-world visual searches, a target object is present with varied probability rather than with even probability. Recent studies have reported that the proportion of target presentation affects visual search performance via a shift of decision criteria. The present study investigated the transferability of this target prevalence effects across two dissociable-prevalence search tasks concurrently performed within a period. We examined this by conducting two separate visual searches where one emerge a varied-prevalence (10, 50, or 90%; prevalence task) whereas the other has a fixed-prevalence at 50% (neutral task). Each task was presented at the unihemifield in a random-order in whole trials. In addition, we assumed that the transferability of prevalence effect may depend on the perceptual similarity across the tasks. The results showed that search performance for the neutral task followed that for the prevalence task when the search stimuli set was perceptually identical across the tasks (Experiment 1B), whereas was independent from the prevalence task when the stimuli were perceptually distinct across the tasks (Experiment 1A). These results indicate that observers could fail to adaptively separate their decision criteria when they engaged in multiple-visual searches each has different probability of target presentation, at least under circumstances in which interferences on perceptual separation across the tasks exist.

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