Repetition and brain potentials when recognizing natural scenes: task and emotion differences
Repetition and brain potentials when recognizing natural scenes: task and emotion differences
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DOI：
10.1093/scan/nss081
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发表时间：
2013-12-01
影响因子：
4.2
通讯作者：
Lang, Peter J.
中科院分区：
文献类型：
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作者：
Ferrari, Vera;Bradley, Margaret M.;Lang, Peter J.
人们早就知道重复可以促进记忆表现，但它对作为识别记忆指标的事件相关电位（ERPs）的影响却没有得到很好的表征。在实验1中，大量重复和分布重复对新旧erp的影响在一个即时识别测试中被评估，随后附带编码的自然场景也在情绪上变化。编码时的分布式重复增强了记忆性能和中央顶叶传感器上新旧ERP差异的幅度。为了评估这些重复效应是否反映了编码或检索的差异，在实验2中，我们将识别任务替换为被动观看新旧图片。在没有明确的识别任务的情况下，erp完全不受重复编码的影响，只有情绪图片会适度增强新旧差异。综上所述，这些数据表明，重复促进了检索过程，并且在没有明确的识别任务的情况下，新旧erp的差异仅在情感线索上明显。
Repetition has long been known to facilitate memory performance, but its effects on event-related potentials (ERPs), measured as an index of recognition memory, are less well characterized. In Experiment 1, effects of both massed and distributed repetition on old-new ERPs were assessed during an immediate recognition test that followed incidental encoding of natural scenes that also varied in emotionality. Distributed repetition at encoding enhanced both memory performance and the amplitude of an old-new ERP difference over centro-parietal sensors. To assess whether these repetition effects reflect encoding or retrieval differences, the recognition task was replaced with passive viewing of old and new pictures in Experiment 2. In the absence of an explicit recognition task, ERPs were completely unaffected by repetition at encoding, and only emotional pictures prompted a modestly enhanced old-new difference. Taken together, the data suggest that repetition facilitates retrieval processes and that, in the absence of an explicit recognition task, differences in old-new ERPs are only apparent for affective cues.