ERP correlates of the incidental retrieval of emotional information: effects of study-test delay.
ERP correlates of the incidental retrieval of emotional information: effects of study-test delay.
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DOI：
10.1016/j.brainres.2009.02.082
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发表时间：
2009-05-07
期刊：
影响因子：
2.9
通讯作者：
Rugg MD
中科院分区：
文献类型：
--
作者：
Jaeger A;Johnson JD;Corona M;Rugg MD
先前的研究表明，在再认记忆的测试中，正确识别的测试项目引起的ERPs根据项目是否在情绪唤起或情绪中性的学习环境中编码而不同。这些先前的研究只采用了相对简短的（约。10分钟）的保留时间间隔。本研究比较了学习-测验延迟与附带情绪提取的ERP相关性。情绪中性物体的图片被编码与情绪消极或情绪中性的场景。在重复测量设计（N=19）中，一半的对象在研究阶段完成后10分钟接受识别记忆测试，而其余的对象在24小时后接受测试。在短暂的延迟后，与情绪背景和中性背景配对的物体引起的ERP与刺激后200 ms左右不同，与情绪场景配对的物体引起更积极的波形。24小时后，两类物体引起的ERP之间的差异仍然是明显的，从刺激后约200毫秒。引人注目的是，这些效果与研究后10分钟获得的效果在极性和头皮分布方面都不同。这些ERP效应的早期发作表明，它们可能反映了一种独立于相关学习背景的有意识回忆的记忆形式。在两个保留时间间隔的效果的质的差异提出的可能性，编码对象进行巩固的过程中，根据不同的情感属性，他们的研究背景。
Prior studies indicate that, in tests of recognition memory, ERPs elicited by correctly recognized test items differ according to whether the items were encoded in an emotionally arousing or an emotionally neutral study context. These prior studies employed only a relatively brief (ca. 10 min) retention interval, however. The present study contrasted the ERP correlates of incidental emotional retrieval as a function of study-test delay. Pictures of emotionally neutral objects were encoded in association with either emotionally negative or emotionally neutral scenes. In a repeated measures design (N=19), half of the objects were subjected to a recognition memory test 10 min after completion of the study phase, whereas the remainder were tested 24 hrs later. After the short delay, ERPs elicited by objects paired with emotional vs. neutral backgrounds differed from around 200 ms post-stimulus, the objects paired with the emotional scenes eliciting the more positive-going waveforms. After 24 hrs, differences between the ERPs elicited by the two classes of object were still apparent from around 200 ms post-stimulus. Strikingly, these effects differed from those obtained 10 min after study in both their polarity and scalp distribution. The early onset of these ERP effects suggests that they may reflect a form of memory independent of the conscious recollection of the associated study contexts. The qualitative differences in the effects at the two retention intervals raises the possibility that the encoded objects were subjected to consolidation processes that differed according to the emotional attributes of their study contexts.
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