Modulation of the C1 visual event-related component by conditioned stimuli: Evidence for sensory plasticity in early affective perception
Modulation of the C1 visual event-related component by conditioned stimuli: Evidence for sensory plasticity in early affective perception
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DOI：
10.1093/cercor/bhj031
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发表时间：
2006-06-01
期刊：
影响因子：
3.7
通讯作者：
Moratti, Stephan
中科院分区：
文献类型：
--
作者：
Stolarova, Margarita;Keil, Andreas;Moratti, Stephan
先前的研究已经证明了在感知的早期对动机显著刺激的优化处理。在本研究中，这种快速分化的时间过程和潜在机制是感兴趣的。我们研究了初级视皮层在条件刺激（CS）情感评价中的参与。为了引起视觉系统内的学习，我们选择情感图片作为无条件刺激，并使用横向光栅作为CS。使用高密度脑电描记术，我们证明了威胁相关刺激与中性刺激对C1视觉事件相关成分的调制，这种调制随着情感意义的持续获得而增加。厌恶性和中性视觉刺激之间的区别早在刺激开始后65-90 ms就发生了，这表明初级视觉区参与了情感评估。作为一个潜在的机制，我们讨论短期重组的视觉皮层，使感官放大的特定视觉功能，与动机相关的信息。
Previous research has demonstrated optimized processing of motivationally significant stimuli early in perception. In the present study, the time course and underlying mechanisms for such fast differentiation are of interest. We investigated the involvement of the primary visual cortex in affective evaluation of conditioned stimuli (CSs). In order to elicit learning within the visual system we chose affective pictures as unconditioned stimuli and used laterally presented gratings as CSs. Using high-density electroencephalography, we demonstrated modulation of the C1 visual event-related component for threat-related stimuli versus neutral stimuli, which increased with continuing acquisition of affective meaning. The differentiation between aversive and neutral visual stimuli occurred as early as 65-90 ms after stimulus onset and suggested involvement of the primary visual areas in affective evaluation. As an underlying mechanism, we discuss short-term reorganization in visual cortex, enabling sensory amplification of specific visual features that are related to motivationally relevant information.