ISSN : 1226-9654
시각탐색에서 표적의 출현확률은 탐색반응 의사결정 기준에 영향을 주어 탐색 효율성을 변화시키며 이는 표적 출현확률 효과로 알려져 있다. 선행 연구는 표적 출현확률을 달리한 독립적인 두 탐색과제를 병행할 때 한 탐색과제의 표적 출현확률 효과가 다른 탐색과제 수행에 전이됨을 관찰했다. 특히 표적 출현확률 차이를 제외하고 두 과제가 시각적으로 동일한 탐색항목을 사용한 경우 이러한 전이 현상이 분명했으나 시각적으로 상이한 경우에는 전이가 관찰되지 않았다. 선행 연구는 표적 출현확률 효과의 전이 실패에 대한 원인으로 탐색항목들 간의 시각적 비유사성을 지목했으나 이러한 해석의 배경이 된 두 탐색과제 사이에는 시각적 유사성의 결여만이 아니라 탐색과제 유형 차원의 분명한 차이가 있었다. 본 연구는 탐색항목을 구성하는 세부특징 중 탐색과 무관한 세부특징은 시각적으로 상이하되 탐색과 직결되는 세부특징은 동일한 두 탐색과제를 실시해 표적 출현확률 효과의 전이 여부를 조사했다. 그 결과 선행 연구와 같이 전이 효과의 부재가 관찰되었으며 이는 표적 출현확률 효과가 시각적, 구체적으로 유사한 탐색과제 간에 전이됨을 시사한다.
The probability of target presence in visual search influences search efficiency by changing the criteria for response-decision making, and this has been known as target prevalence effect (TPE). Our previous study observed that the TPE in one search task with varying target prevalence was transferred to the performance of the other concurrent search task. Specifically, the study found a transfer of the TPE when the search items were visually identical between the search tasks but differed in their target prevalence, but found no such transfer when they were visually dissimilar. The study accordingly pinpointed to a lack of visual similarity between the search tasks for the absence of the TPE. Nevertheless, the search tasks did not only differ visually, but also differed in the way each search task was defined. The present study examined whether the TPE can be transferred across two search tasks where search-relevant features of the search items were exactly identical to each other but their search-irrelevant features were visually dissimilar. The results showed no indication of a transfer of the TPE, suggesting that the TPE can only be transferable across the search tasks where their search items are visually and specifically similar to each other.
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