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Effects of Transcranial Direct Current Stimulation on the Recognition of Bodily Emotions from Point-Light Displays

机译:经颅直流电刺激对点光源显示器对身体情绪的识别作用

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摘要

Perceiving human motion, recognizing actions, and interpreting emotional body languageare tasks we perform daily and which are supported by a network of brain areas includingthe human posterior superior temporal sulcus (pSTS). Here, we applied transcranialdirect current stimulation (tDCS) with anodal (excitatory) or cathodal (inhibitory) electrodesmounted over right pSTS (target) and orbito-frontal cortex (reference) while healthyparticipants performed a bodily emotion recognition task using biological motion pointlightdisplays (PLDs). Performance (accuracy and reaction times) was also assessed ona control task which was matched to the emotion recognition task in terms of cognitiveand motor demands. Each subject participated in two experimental sessions, receivingeither anodal or cathodal stimulation, which were separated by one week to avoidresidual effects of previous stimulations. Overall, tDCS brain stimulation did not affectthe recognition of emotional states from PLDs. However, when emotions with a negativeor positive–neutral emotional valence were analyzed separately, effects of stimulationwere shown for recognizing emotions with a negative emotional valence (sadness andanger), indicating increased recognition performance when receiving anodal (excitatory)stimulation compared to cathodal (inhibitory) stimulation over pSTS. No stimulation effectswere shown for the recognition of emotions with positive–neutral emotional valences.These findings extend previous studies showing structure–function relationships betweenSTS and biological motion processing from PLDs and provide indications that stimulationeffects may be modulated by the emotional valence of the stimuli.
机译:感知人体运动,识别动作并解释情感肢体语言是我们每天执行的任务,并且得到包括人类后颞上沟(pSTS)在内的大脑区域网络的支持。在这里,我们将经颅直流电刺激(tDCS)与安装在右侧pSTS(目标)和眶额皮质(参考)上的阳极(兴奋性)或阴极(抑制性)电极配合使用,而健康参与者使用生物运动点光源显示器(PLDs)执行身体情感识别任务。在控制任务上评估了性能(准确性和反应时间),该任务与认知和运动需求方面的情绪识别任务相匹配。每个受试者参加了两次实验性课程,分别接受阳极或阴极刺激,相隔一周,以避免先前刺激的残留效应。总体而言,tDCS的大脑刺激并未影响对PLD情绪状态的识别。然而,当分别分析具有负性或正性-中性情绪价的情绪时,显示出刺激的效果可以识别具有负性情绪价(悲伤和愤怒)的情绪,这表明与阳极性(抑制性)相比,接受阳极(兴奋性)刺激时的识别性能增强。通过pSTS进行刺激。没有发现刺激作用可以识别具有正中性情绪价的情绪。这些发现扩展了以前的研究,显示了STS和PLD的生物运动过程之间的结构-功能关系,并表明刺激作用的情绪价可能会调节刺激作用。

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