Inaba Midori, Kamishima Kyoko, Ohira Hideki
Graduate School of Information Systems, Department of Information Management Science, The University of Electro-Communications, 1-5-1 Chofugaoka, Chofu-City, Tokyo 182-8585, Japan.
Brain Res. 2007 Feb 16;1133(1):100-9. doi: 10.1016/j.brainres.2006.07.010. Epub 2006 Dec 29.
The positive-going shift of event-related potential (ERP) components that occur when recognizing emotional words has been thought to be due to valence effects on either recollection or familiarity. This study investigated the independent contributions of recollection and familiarity on recognition of emotional words in order to examine which is thus responsible for the greater magnitude of ERP components seen in response to recognition of emotional, as opposed to neutral words. ERPs were measured while participants completed an exclusion recognition task. In the test phase, participants were required to respond "old" only to target items, which were included in one of two lists that were presented in the study phase. They were also asked to respond "new" to distracters and non-target items that were in the other previously presented list. "Old" responses to targets and non-targets were contrasted with an ERP analysis. Results suggested that the late positivity reflected recollection. The magnitude of this positivity, elicited around the left parietal area, was greater for negative stimuli compared to neutral and positive stimuli. The findings of the present study suggested that enhanced recollection of negative words may contribute to increased magnitudes of components such as the LPC. The emotional valence of words may have separate behavioral and electrophysiological effects on recollection and familiarity.
当识别情绪性词语时出现的事件相关电位（ERP）成分的正向偏移，一直被认为是由于效价对回忆或熟悉度的影响。本研究调查了回忆和熟悉度对情绪性词语识别的独立贡献，以检验究竟是哪一个因素导致了在识别情绪性词语（与中性词语相对）时观察到的更大幅度的ERP成分。在参与者完成排除识别任务时测量ERP。在测试阶段，参与者仅被要求对目标项目回答“旧的”，这些目标项目包含在研究阶段呈现的两个列表之一中。他们还被要求对出现在另一个先前呈现列表中的干扰项和非目标项目回答“新的”。通过ERP分析对比了对目标和非目标的“旧的”反应。结果表明，晚期正波反映了回忆。在左顶叶区域周围引发的这种正波幅度，与中性和积极刺激相比，消极刺激时更大。本研究结果表明，对消极词语的回忆增强可能导致诸如晚期正成分（LPC）等成分幅度增加。词语的情绪效价可能对回忆和熟悉度有独立的行为和电生理效应。
