Laboratory of Psychopathology and Neuropsychology, Université Paris 8, 93526 Saint-Denis, France.
J Neurosci. 2012 Mar 28;32(13):4531-9. doi: 10.1523/JNEUROSCI.5636-11.2012.
Communicative intentions are transmitted by many perceptual cues, including gaze direction, body gesture, and facial expressions. However, little is known about how these visual social cues are integrated over time in the brain and, notably, whether this binding occurs in the emotional or the motor system. By coupling magnetic resonance and electroencephalography imaging in humans, we were able to show that, 200 ms after stimulus onset, the premotor cortex integrated gaze, gesture, and emotion displayed by a congener. At earlier stages, emotional content was processed independently in the amygdala (170 ms), whereas directional cues (gaze direction with pointing gesture) were combined at ∼190 ms in the parietal and supplementary motor cortices. These results demonstrate that the early binding of visual social signals displayed by an agent engaged the dorsal pathway and the premotor cortex, possibly to facilitate the preparation of an adaptive response to another person's immediate intention.
交际意图通过多种感知线索传递，包括目光方向、身体姿势和面部表情。然而，人们对于这些视觉社交线索在大脑中是如何随时间整合的知之甚少，特别是这种结合是发生在情绪系统还是运动系统中。通过在人类中结合磁共振和脑电图成像，我们能够表明，在刺激开始后 200 毫秒，运动前皮层整合了同伴显示的目光、姿势和情绪。在早期阶段，杏仁核（170 毫秒）独立处理情绪内容，而在顶叶和补充运动皮层中，方向线索（指向姿势的目光方向）在约 190 毫秒时组合。这些结果表明，代理显示的视觉社交信号的早期结合涉及到背侧通路和运动前皮层，可能有助于为另一个人的即时意图做好适应性反应的准备。
