EFFECT OF EMOTIONAL VALENCE OF STIMULI ON RECOGNITION OF DISTRACTERS AT RETRIEVAL: AN EVENT-RELATED POTENTIAL STUDY
Inaba, M., Nomura, M. and Ohira, H., Nagoya University, Japan
There are findings that identification of new items that have emotionally negative valence is difficult. In studies of false memory, it has been suggested that responses to distracters in recognition memory task would be formed at the time of encoding. By contrast, there are also evidences that judges to new items could be constructed in the process of retrieval. False recognition of lures is product of faulty monitoring at retrieval (Rubin et al., 1999). The present study investigated the distinction of monitoring processes of new words due to emotional valence. The experiment took the form of a single study-test cycle to acquire event-related potential (ERP) in the test phase. The stimuli were emotionally positive, negative, and neutral words. Amplitudes of a right frontal ERP component in the late latency, which is thought to reflect the extent of retrieval success, to emotionally negative new words were much smaller than those to negative old words. Moreover, considering the response time, it was suggested that it took longer for monitoring negative distracters. Although the difference of correct rejection rates between neutral items and negative ones was not significant, the findings showed that subjects could feel the difficulty in monitoring the once-judged negative distracters. The ERP amplitude to positive new words was small as well as negative words, and the duration of monitoring positive distracters seemed so short that behavioral performance of these items was low.