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首页> 外文期刊>The European Journal of Neuroscience >When neutral turns significant: brain dynamics of rapidly formed associations between neutral stimuli and emotional contexts
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When neutral turns significant: brain dynamics of rapidly formed associations between neutral stimuli and emotional contexts

机译：当中性变得重要时：中性刺激与情绪环境之间迅速形成的关联的大脑动力学

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摘要

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 (450-750ms) 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.
机译：将中性刺激与动机相关结果相关联的能力是重要的生存策略。在这项研究中，我们使用事件相关电位（ERP）来研究参与者面对多种异质性信息时联想情感学习的大脑动力学。参与者在144个不同的情感和中立的背景场景中查看了144个不同的对象。在每次试验期间，将中立的物体隔离显示，然后与背景场景配对。所有配对均出现两次，以比较单次关联之前和之后ERP对中性对象的响应。单次配对后，与先前与中性场景配对的对象相比，先前在情感场景中进行编码的中性对象在枕骨电极上引起了更大的P100。同样，相对于中立情境，先前与情绪相关的物体在顶枕电极（450-750ms）上观察到较大的晚期正电位（LPP）。 LPP（但不是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数据为快速的情感联想学习提供了证据，这体现在对情感环境中以前遇到的中性信息的感知和持续精化处理上。这些发现可能有助于理解压力和焦虑以及成瘾和饮食相关疾病中的结合机制。

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