Shen Guannan, Saby Joni N, Drew Ashley R, Marshall Peter J
Department of Psychology, Temple University, Weiss Hall, 1801 N Broad St, Philadelphia, PA 19122, USA.
Institute for Learning and Brain Sciences, University of Washington, USA.
Brain Res. 2017 Mar 15;1659:8-18. doi: 10.1016/j.brainres.2017.01.022. Epub 2017 Jan 19.
This study explored interpersonal influences on electrophysiological responses during the anticipation of tactile stimulation. It is well-known that broad, negative-going potentials are present in the event-related potential (ERP) between a forewarning cue and a tactile stimulus. It has also been shown that the alpha-range mu rhythm shows a lateralized desynchronization over central electrode sites during anticipation of tactile stimulation of the hand. The current study used a tactile discrimination task in which a visual cue signaled that an upcoming stimulus would either be delivered 1500ms later to the participant's hand, to a task partner's hand, or to neither person. For the condition in which participants anticipated the tactile stimulation to their own hand, a negative potential (contingent negative variation, CNV) was observed in the ERP at central sites in the 1000ms prior to the tactile stimulus. Significant mu rhythm desynchronization was also present in the same time window. The magnitudes of the ERPs and of the mu desynchronization were greater in the contralateral than in the ipsilateral hemisphere prior to right hand stimulation. Similar ERP and EEG changes were not present when the visual cue indicated that stimulation would be delivered to the task partner or to neither person. The absence of social influences during anticipation of tactile stimulation, and the relationship between the two brain signatures of anticipatory attention (CNV and mu rhythm) are discussed.
本研究探讨了在预期触觉刺激过程中人际因素对电生理反应的影响。众所周知，在预警提示与触觉刺激之间的事件相关电位（ERP）中存在广泛的负向电位。研究还表明，在预期对手部进行触觉刺激时，α频段的μ节律在中央电极部位会出现侧化去同步化。当前研究采用了一项触觉辨别任务，其中视觉提示表明即将到来的刺激将在1500毫秒后施加到参与者的手部、任务伙伴的手部，或者不施加给任何人。对于参与者预期自身手部会受到触觉刺激的情况，在触觉刺激前1000毫秒的中央部位ERP中观察到一个负向电位（关联性负变，CNV）。在同一时间窗口内也存在显著的μ节律去同步化。在右手刺激前，对侧半球的ERP和μ去同步化幅度大于同侧半球。当视觉提示表明刺激将施加给任务伙伴或不施加给任何人时，未出现类似的ERP和脑电图变化。本文讨论了在预期触觉刺激过程中社会影响的缺失，以及预期性注意的两种脑电特征（CNV和μ节律）之间的关系。
