Engineering Research Center of Molecular and Neuro Imaging of Ministry of Education, School of Life Science and Technology, Xidian University, Xi'an, Shaanxi 710071, China.
School of Electronic Engineering, Xidian University, Xi'an, Shaanxi 710071, China.
Int J Psychophysiol. 2020 Jun;152:26-35. doi: 10.1016/j.ijpsycho.2020.04.003. Epub 2020 Apr 8.
Neuronal oscillatory activity has been considered to play a key role in face processing through its functional effect on information flow and exchange in human brain. Specifically, most neuronal oscillatory activity is measured in different rhythm based on the electrophysiological signal at single channel level. Although, the neuronal oscillatory coupling between neuronal assembles is associated with the information flow and exchange between brain regions, few studies focus on this type of neuronal oscillatory activity in face processing. In this study, the neuronal oscillatory coupling was investigated based on electroencephalographic (EEG) data of 20 participants, which were recorded when the participants were in a face/non-face perceptual task. The phase lag index (PLI) was used to assess the neuronal oscillatory coupling between brain regions in typical frequency bands. Enhanced short-range coupling was observed in theta (4-8 Hz) and alpha (8-12 Hz) band over the frontal region, in gamma1 (30-49 Hz) band over the left posterior and occipito-temporal regions, and in gamma2 (51-75 Hz) over the right temporal region during face perception compared with non-face perception. Long-range coupling was increased in theta and gamma band over the right hemisphere during face perception. Moreover, increased long-range coupling was observed in alpha band over the left and right hemisphere respectively during face perception. The results suggested that frequency-specific neuronal oscillatory coupling within and between regions of frontal cortex and the ventral visual pathway played an important role in face perception, which might reflect underlying neural mechanism of face perception.
神经元的振荡活动被认为通过其在人脑信息流动和交换中的功能效应，在面部处理中发挥关键作用。具体来说，大多数神经元的振荡活动是在单通道水平的电生理信号基础上，基于不同的节律进行测量的。虽然神经元集合之间的神经元振荡耦合与脑区之间的信息流动和交换有关，但很少有研究关注面部处理中的这种类型的神经元振荡活动。在这项研究中，基于 20 名参与者在进行面孔/非面孔感知任务时的脑电图 (EEG) 数据，研究了神经元的振荡耦合。相位滞后指数 (PLI) 用于评估典型频带中脑区之间的神经元振荡耦合。与非面孔感知相比，在面孔感知时，额区的 theta (4-8 Hz) 和 alpha (8-12 Hz) 频段观察到增强的短程耦合，左后和枕颞区的 gamma1 (30-49 Hz) 频段以及颞区的 gamma2 (51-75 Hz) 频段观察到增强的短程耦合。面孔感知时，右半球的 theta 和 gamma 频段的长程耦合增加。此外，面孔感知时，左、右半球的 alpha 频段的长程耦合增加。结果表明，额皮质和腹侧视觉通路区域内和区域之间的特定频率的神经元振荡耦合在面孔感知中起着重要作用，这可能反映了面孔感知的潜在神经机制。
