Pizzagalli D, Koenig T, Regard M, Lehmann D
EEG-EP Mapping Laboratory, Department of Neurology, University Hospital, Zurich, Switzerland.
Neuropsychologia. 1998 Apr;36(4):323-32. doi: 10.1016/s0028-3932(97)00117-6.
Covert brain activity related to task-free, spontaneous (i.e. unrequested), emotional evaluation of human face images was analysed in 27-channel averaged event-related potential (ERP) map series recorded from 18 healthy subjects while observing random sequences of face images without further instructions. After recording, subjects self-rated each face image on a scale from "liked" to "disliked". These ratings were used to dichotomize the face images into the affective evaluation categories of "liked" and "disliked" for each subject and the subjects into the affective attitudes of "philanthropists" and "misanthropists" (depending on their mean rating across images). Event-related map series were averaged for "liked" and "disliked" face images and for "philanthropists" and "misanthropists". The spatial configuration (landscape) of the electric field maps was assessed numerically by the electric gravity center, a conservative estimate of the mean location of all intracerebral, active, electric sources. Differences in electric gravity center location indicate activity of different neuronal populations. The electric gravity center locations of all event-related maps were averaged over the entire stimulus-on time (450 ms). The mean electric gravity center for disliked faces was located (significant across subjects) more to the right and somewhat more posterior than for liked faces. Similar differences were found between the mean electric gravity centers of misanthropists (more right and posterior) and philanthropists. Our neurophysiological findings are in line with neuropsychological findings, revealing visual emotional processing to depend on affective evaluation category and affective attitude, and extending the conclusions to a paradigm without directed task.
在18名健康受试者观察无进一步指示的人脸图像随机序列时，记录了27通道平均事件相关电位（ERP）图谱系列，分析了与无任务、自发（即非要求的）人脸图像情感评估相关的隐蔽大脑活动。记录后，受试者对每张人脸图像从“喜欢”到“不喜欢”进行自评。这些评分用于将人脸图像分为每个受试者的“喜欢”和“不喜欢”情感评估类别，并将受试者分为“慈善家”和“厌世者”的情感态度类别（取决于他们对所有图像的平均评分）。对“喜欢”和“不喜欢”的人脸图像以及“慈善家”和“厌世者”的事件相关图谱系列进行平均。通过电重心对电场图的空间配置（地形图）进行数值评估，电重心是所有脑内活跃电源平均位置的保守估计。电重心位置的差异表明不同神经元群体的活动。所有事件相关图谱的电重心位置在整个刺激开启时间（450毫秒）内进行平均。不喜欢的人脸的平均电重心位置（在受试者中具有显著性）比喜欢的人脸更靠右且稍靠后。在厌世者（更靠右且靠后）和慈善家的平均电重心之间也发现了类似差异。我们的神经生理学发现与神经心理学发现一致，揭示了视觉情感处理取决于情感评估类别和情感态度，并将这些结论扩展到无定向任务的范式中。
