Izmaĭlov Ch A, Korshunova S G, Sokolov E N
Department of Psychophysiology, Lomonosov State University, Moscow.
Zh Vyssh Nerv Deiat Im I P Pavlova. 2000 Sep-Oct;50(5):805-18.
Human cortical visual potentials (VEP) were studied to obtain electrophysiological data concerning face discrimination and to compare them with the direct estimates of differences between faces obtained in the previous publications. The present schematic faces varied in curvature of a mouth and/or declination of eyebrows. These features determined the emotional expression of the schematic faces. We recorded the VEP as the response to the instant replacement of one schematic face (referent stimulus) by an other one (test stimulus) rather then to presentation of a single stimulus. Thus we recorded direct electrophysiological differences between schematic faces. A characteristic feature of this approach was the application of the set of functionally connected test stimuli with monotonously increasing values of differences between the referent and test stimuli. In a result of analysis the complex of components P120-N180-P230 in sites O1, O2, P3, P4, T5, T6 was described. Interpeaks amplitudes of the components shows high correlations with subjective differences between the same pairs of stimuli as well as with physical (configurative) differences between stimuli measured as the angles of lines, defining curvature of a mouth and a declination of eyebrows. The highest correlation with subjective estimates of emotional differences between faces was shown by interpeaks amplitudes N180-P230 in sites O1 and P3. In the some time the interpeaks amplitudes P120-N180 in sites O1 and T5 reflected highest correlation between configurative measures and subjective estimates of stimuli differences.
对人类皮层视觉诱发电位（VEP）进行了研究，以获取有关面部识别的电生理数据，并将其与先前出版物中获得的面部差异直接估计值进行比较。当前的示意图面孔在嘴巴的曲率和/或眉毛的倾斜度方面有所不同。这些特征决定了示意图面孔的情感表达。我们记录VEP是作为对一张示意图面孔（参照刺激）被另一张（测试刺激）瞬间替换的反应，而不是对单个刺激的呈现。因此，我们记录了示意图面孔之间的直接电生理差异。这种方法的一个特点是应用了一组功能相关的测试刺激，其参照刺激和测试刺激之间的差异值单调增加。分析结果描述了在O1、O2、P3、P4、T5、T6部位的P120-N180-P230成分复合体。这些成分的峰间振幅与相同刺激对之间的主观差异以及与作为线条角度测量的刺激之间的物理（构型）差异高度相关，这些线条角度定义了嘴巴的曲率和眉毛的倾斜度。O1和P3部位的峰间振幅N180-P230与面部情感差异的主观估计显示出最高的相关性。同时，O1和T5部位的峰间振幅P120-N180反映了构型测量与刺激差异主观估计之间的最高相关性。
