In the mind's eye: The late positive potential to negative and neutral mental imagery and intolerance of uncertainty.
In the mind's eye: The late positive potential to negative and neutral mental imagery and intolerance of uncertainty.
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DOI：
10.1111/psyp.13024
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发表时间：
2018-05
期刊：
影响因子：
3.7
通讯作者：
MacNamara A
中科院分区：
文献类型：
--
作者：
MacNamara A
在没有外感受刺激的情况下，人类产生和维持心理意象的能力有很多优势。然而，这种能力也可能导致情绪障碍，其特征是担心、沉思或对未来过度担忧。例如，基于恐惧的疾病的特征可能是对负面意象的 ERP 升高。另一方面，痛苦障碍的特征可能是试图避免参与消极的心理意象，从而减少皮层反应。先前的 ERP 工作使用消极和中性的图片刺激来建立健康个体的反应参数，然后将这些范式应用于临床样本以评估异常的情绪处理。然而，尽管具有临床相关性，迄今为止还没有研究能够对标准化的负面想象场景引发晚期正电位（LPP），这是一种强有力的情绪处理测量方法。在这里，参与者聆听负面和中性场景的音频描述，并被要求尽可能生动地想象这些场景。结果显示，想象的负面场景会引发晚期正向电位 (LPP) 增加，在音频描述偏移后持续约 10 秒，同时提高唤醒和不愉快的评级。此外，自我报告对不确定的未来事件有更大的认知担忧（对不确定性的预期不容忍程度更高）的参与者表现出 LPP 的情绪调节减少。这些数据提供了在缺乏显着视觉线索的情况下对标准化负面意象进行持续电皮层处理的第一个证据，并表明未选择的样本中焦虑的认知风险可能通过对负面意象的钝化 LPP 来表征。
There are many advantages to human beings’ ability to generate and sustain mental imagery in the absence of exteroceptive stimuli; however, this ability may also underlie emotional disorders characterized by worry, rumination or excessive concern about the future. For instance, fear-based disorders may be characterized by heightened ERPs to negative imagery. On the other hand, distress disorders may be characterized by attempts to avoid engaging with negative mental imagery, and therefore reduced electrocortical response. Prior ERP work has used negative and neutral pictorial stimuli to establish the parameters of response in healthy individuals, before taking these paradigms to clinical samples to assess aberrant emotion processing. Yet despite its clinical relevance, no study to date has elicited a late positive potential (LPP), a robust measure of emotion processing, to standardized negative imagined scenes. Here, participants listened to audio descriptions of negative and neutral scenes, and were asked to imagine these scenes as vividly as possible. Results showed that negative imagined scenes elicited an increased late positive potential (LPP), lasting approximately 10 seconds after audio description offset, as well as heightened ratings of arousal and unpleasantness. Moreover, participants with greater self-reported cognitive concerns about uncertain future events (higher prospective intolerance of uncertainty) showed reduced emotional modulation of the LPP. These data provide the first evidence of sustained electrocortical processing of standardized negative imagery elicited in the absence of salient visual cues, and suggest that cognitive risk for anxiety in an unselected sample may be represented phenotypically by blunted LPPs to negative imagery.
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