When neutral turns significant: brain dynamics of rapidly formed associations between neutral stimuli and emotional contexts
When neutral turns significant: brain dynamics of rapidly formed associations between neutral stimuli and emotional contexts
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DOI：
10.1111/ejn.13319
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发表时间：
2016-06
影响因子：
3.4
通讯作者：
C. Ventura-Bort;Andreas Löw;J. Wendt;F. Dolcos;A. Hamm;M. Weymar
中科院分区：
文献类型：
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作者：
C. Ventura-Bort;Andreas Löw;J. Wendt;F. Dolcos;A. Hamm;M. Weymar
将中性刺激与动机相关的结果联系起来的能力是一种重要的生存策略。在这项研究中，我们使用事件相关电位(ERPs)来研究当参与者面对多个异质信息时联想情绪学习的脑动力学。参与者在144个不同的情感和中性背景场景中观看了144个不同的物体。在每一次试验中，中性物体被隔离显示，然后与背景场景配对。所有配对被呈现两次，以比较单一关联前后对中性物体的反应的事件相关电位。在单次配对后，与之前与中性场景配对的对象相比，先前在情绪场景背景下编码的中性对象在枕叶电极上诱发了更大的P100。同样，对于先前与情绪相关的对象，在顶枕电极(450-750ms)上观察到相对于中性环境的更大的晚期正电位(LPP)。LPP-而不是P100-的增强也与主观对象/上下文绑定有关。综上所述，我们的ERP数据为快速情绪联想学习提供了证据，这反映在对先前在情绪环境中遇到的中性信息的高度感知和持续精心加工上。这些发现有助于理解压力和焦虑以及成瘾和饮食相关障碍的绑定机制。
The ability to associate neutral stimuli with motivationally relevant outcomes is an important survival strategy. In this study, we used event‐related potentials (ERPs) to investigate brain dynamics of associative emotional learning when participants were confronted with multiple heterogeneous information. Participants viewed 144 different objects in the context of 144 different emotional and neutral background scenes. During each trial, neutral objects were shown in isolation and then paired with the background scene. All pairings were presented twice to compare ERPs in response to neutral objects before and after single association. After single pairing, neutral objects previously encoded in the context of emotional scenes evoked a larger P100 over occipital electrodes compared to objects that were previously paired with neutral scenes. Likewise, larger late positive potentials (LPPs) were observed over parieto‐occipital electrodes (450–750 ms) for objects previously associated with emotional relative to neutral contexts. The LPP – but not P100 – enhancement was also related to subjective object/context binding. Taken together, our ERP data provide evidence for fast emotional associative learning, as reflected by heightened perceptual and sustained elaborative processing for neutral information previously encountered in emotional contexts. These findings could assist in understanding binding mechanisms in stress and anxiety, as well as in addiction and eating‐related disorders.