Center for the Study of Emotion and Attention, University of Florida, Gainesville, FL, USA.
Hum Brain Mapp. 2012 Dec;33(12):2920-31. doi: 10.1002/hbm.21413. Epub 2011 Sep 23.
Viewing emotional pictures is associated with heightened perception and attention, indexed by a relative increase in visual cortical activity. Visual cortical modulation by emotion is hypothesized to reflect re-entrant connectivity originating in higher-order cortical and/or limbic structures. The present study used dense-array electroencephalography and individual brain anatomy to investigate functional coupling between the visual cortex and other cortical areas during affective picture viewing. Participants viewed pleasant, neutral, and unpleasant pictures that flickered at a rate of 10 Hz to evoke steady-state visual evoked potentials (ssVEPs) in the EEG. The spectral power of ssVEPs was quantified using Fourier transform, and cortical sources were estimated using beamformer spatial filters based on individual structural magnetic resonance images. In addition to lower-tier visual cortex, a network of occipito-temporal and parietal (bilateral precuneus, inferior parietal lobules) structures showed enhanced ssVEP power when participants viewed emotional (either pleasant or unpleasant), compared to neutral pictures. Functional coupling during emotional processing was enhanced between the bilateral occipital poles and a network of temporal (left middle/inferior temporal gyrus), parietal (bilateral parietal lobules), and frontal (left middle/inferior frontal gyrus) structures. These results converge with findings from hemodynamic analyses of emotional picture viewing and suggest that viewing emotionally engaging stimuli is associated with the formation of functional links between visual cortex and the cortical regions underlying attention modulation and preparation for action.
观看情绪图片与增强的感知和注意力有关，这可以通过视觉皮层活动的相对增加来衡量。情绪对视觉皮层的调节被假设反映了源自高级皮质和/或边缘结构的折返连接。本研究使用高密度脑电和个体大脑解剖结构来研究在观看情感图片时视觉皮层与其他皮质区域之间的功能耦合。参与者观看愉快、中性和不愉快的图片，这些图片以 10 Hz 的频率闪烁，以在 EEG 中引发稳态视觉诱发电位 (ssVEP)。使用傅里叶变换量化 ssVEP 的频谱功率，并使用基于个体结构磁共振图像的波束形成空间滤波器估计皮质源。除了较低层次的视觉皮层外，当参与者观看情感（无论是愉快还是不愉快）图片时，与中性图片相比，枕颞和顶叶（双侧楔前叶、下顶叶小叶）结构的网络显示出增强的 ssVEP 功率。在情绪处理过程中，双侧枕叶极与颞叶（左侧中/下颞回）、顶叶（双侧顶叶小叶）和额叶（左侧中/下额回）结构的网络之间的功能耦合增强。这些结果与情绪图片观看的血流动力学分析结果一致，表明观看情感吸引的刺激与视觉皮层与注意力调节和行动准备相关的皮质区域之间形成功能联系有关。
