본 연구는 얼굴자극의 검사단계 표정변화와 검사 지연시간, 그리고 배경변화가 얼굴재인에 미치는 효과를 검증하기 위해 수행되었다. 실험 1에서는 학습단계에서 부정 표정 얼굴을 학습하고 검사단계에서 동일한 얼굴의 부정 표정과 중성 표정얼굴에 대한 재인 검사가 실시되었다. 실험 2에서는 학습단계에서 부정 표정 얼굴을 학습하고 검사단계에서 부정 표정과 긍정 표정얼굴에 대한 재인 검사가 실시되었다. 실험 3에서는 학습단계에서 중성 표정 얼굴을 학습하고, 검사단계에서 부정 표정과 중성 표정 얼굴에 대한 재인 검사가 실시되었다. 세 실험 모두 참가자들은 즉시 검사와 지연 검사 조건에 할당되었고, 재인검사에서 목표 얼굴자극들은 배경이 일치 조건으로 또한 불일치 조건으로 제시되었다. 실험 1과 실험2 모두에서 부적 표정에 대한 재인율이 높았다. 실험 3에서 중성 표정에 대한 재인율이 높았다. 즉, 세 개 실험 모두에서 표정 일치 효과가 나타났다. 학습단계에서 제시된 얼굴 표정의 정서와는 상관없이 검사단계에서 표정이 학습단계와 일치할 때 얼굴 재인율은 증가하였다. 또한 표정 변화에 따른 효과는 배경 변화에 따라 상이하게 나타났다. 본 연구 결과로 얼굴은 표정이 달라지면 기억하기 힘들며, 배경의 변화와 시간 지연에 따라 영향을 받는 다는 점을 확인하였다.
The present study was conducted to investigate how emotional expression change, test delay, and background influence on face recognition. In experiment 1, participants were presented with negative faces at study phase and administered for standard old-new recognition test including targets of negative and neutral expression for the same faces. In experiment 2, participants were studied negative faces and tested by old-new face recognition test with targets of negative and positive faces. In experiment 3, participants were presented with neutral faces at study phase and had to identify the same faces with no regard for negative and neutral expression at face recognition test. In all three experiments, participants were assigned into either immediate test or delay test, and target faces were presented in both white and black background. Results of experiments 1 and 2 indicated higher rates for negative faces than neutral or positive faces. Facial expression consistency enhanced face recognition memory. In experiment 3, the superiority of facial expression consistency were demonstrated by higher rates for neutral faces at recognition test. If facial expressions were consistent across encoding and retrieval, memory performance on face recognition were enhanced in all three experiments. And the effect of facial expression change have different effects on background conditions. The findings suggest that facial expression change make face identification hard, and time and background also affect on face recognition.
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