Shedding light on emotional perception: Interaction of brightness and semantic content in extrastriate visual cortex
Shedding light on emotional perception: Interaction of brightness and semantic content in extrastriate visual cortex
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DOI：
10.1016/j.neuroimage.2016.03.020
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发表时间：
2016-06-01
期刊：
影响因子：
5.7
通讯作者：
Mueller，Matthias M.
中科院分区：
文献类型：
--
作者：
Schettino，Antonio;Keil，Andreas;Mueller，Matthias M.
从视觉环境中快速提取情感线索对于灵活的行为至关重要。先前的研究已经报道了两个事件相关电位（ERP）成分的情绪依赖性幅度调制-N1和EPN -反映了纹外视觉区的感觉获得控制机制。然而，目前还不清楚这两个组件是否是选择性的电生理标记的注意力定向到情感材料或也受到物理特征的视觉刺激。为了解决这个问题，研究人员记录了17名男性参与者在观看原始和明亮版本的中性和色情图片时的大脑电活动。明亮的中性场景被认为比原始版本更令人愉快，而色情场景在原始版本中呈现时被认为更积极。经典和质量单变量ERP分析显示，较大的N1振幅的原始相对于明亮的色情图片，与原始和明亮的中性场景没有差异。相反，EPN只受图片内容而不是亮度的调制，证实了这个组件是一个独特的电生理标记的注意力分配到情感材料的想法。补充地形分析显示，早期选择性表达的中央顶叶的积极性后，介绍了原始的色情场景，反映了招聘的神经网络与持续的注意力和促进记忆编码的动机相关的材料。总的来说，这些结果表明，神经网络对提取的情感信息的差异招聘取决于低层次的感知功能，最终影响情感评价。
The rapid extraction of affective cues from the visual environment is crucial for flexible behavior. Previous studies have reported emotion-dependent amplitude modulations of two event-related potential (ERP) components – the N1 and EPN – reflecting sensory gain control mechanisms in extrastriate visual areas. However, it is unclear whether both components are selective electrophysiological markers of attentional orienting toward emotional material or are also influenced by physical features of the visual stimuli. To address this question, electrical brain activity was recorded from seventeen male participants while viewing original and bright versions of neutral and erotic pictures. Bright neutral scenes were rated as more pleasant compared to their original counterpart, whereas erotic scenes were judged more positively when presented in their original version. Classical and mass univariate ERP analysis showed larger N1 amplitude for original relative to bright erotic pictures, with no differences for original and bright neutral scenes. Conversely, the EPN was only modulated by picture content and not by brightness, substantiating the idea that this component is a unique electrophysiological marker of attention allocation toward emotional material. Complementary topographic analysis revealed the early selective expression of a centro-parietal positivity following the presentation of original erotic scenes only, reflecting the recruitment of neural networks associated with sustained attention and facilitated memory encoding for motivationally relevant material. Overall, these results indicate that neural networks subtending the extraction of emotional information are differentially recruited depending on low-level perceptual features, which ultimately influence affective evaluations.