Sobótka S, Grodzicka J
Acta Neurobiol Exp (Wars). 1989;49(5):265-80.
Sixteen right-handed subjects (8 male and 8 female) were asked to compare two faces or two words successively presented at the centre of the visual field. The brain's electrical activity was recorded from the scalp at symmetrical points of the left and right occipital lobes (0(1) and 0(2)) and posterior temporal lobes (T5 and T6). The reference electrode was placed on the scalp vertex (Cz). A multi-factor analysis of variance revealed significant hemispheric differences of the N243 and P406 amplitudes. For the N243 the opposite asymmetry was found for faces and words. For the face matching the N243 amplitude was higher in the right hemisphere, whereas for word matching it was higher in the left hemisphere. For the P406 the asymmetry was in the same direction both for faces and words, with higher amplitude in the left hemisphere. In the case of face matching the hemispheric difference in the P406 was more pronounced, due to a negative shift of the potential in the left hemisphere in the latency range of 200-1,500 ms. Functional asymmetry of the brain in face perception thus appears to be reflected in the brain's electrical activity. We conclude that differentiation in hemispheric functions takes place while encoding information about stimulus in short term memory.
16名右利手受试者（8名男性和8名女性）被要求依次比较在视野中心相继呈现的两张面孔或两个单词。从头皮上记录大脑在左右枕叶（O1和O2）以及颞叶后部（T5和T6）对称点的电活动。参考电极置于头皮顶点（Cz）。多因素方差分析显示N243和P406波幅存在显著的半球差异。对于N243，面孔和单词呈现出相反的不对称性。在面孔匹配时，右半球的N243波幅更高，而在单词匹配时，左半球的N243波幅更高。对于P406，面孔和单词的不对称性方向相同，左半球波幅更高。在面孔匹配时，P406的半球差异更为明显，这是由于在200 - 1500毫秒潜伏期范围内左半球电位出现负向偏移。因此，大脑在面孔感知中的功能不对称似乎反映在大脑的电活动中。我们得出结论，在对短期记忆中刺激信息进行编码时，半球功能会发生分化。
