Unexpected or changing facial expressions are known to be able to engage more automatic processing than frequently occurring facial expressions, thereby inducing a neural differential wave response known as expression mismatch negativity (EMMN). Recent studies have shown that EMMN can be modulated by the observer's facial feedback (i.e., feedback from their own facial movements). A similar EMMN activity has been discovered for body expressions, but thus far only a few emotion types have been investigated. It is unknown whether the EMMNs evoked by body expressions can be influenced by facial feedback. To explore this question, we recorded EEG activity of 29 participants in the reverse oddball paradigm. Here two unexamined categories of body expressions were presented, happy and sad, placed in two paired stimulus sequences: in one the happy body was presented with a probability of 80% (standards) while the sad body was presented with a probability of 20% (deviants), and in the other the probabilities were reversed. The facial feedback was manipulated by different pen holding conditions (i.e., participants holding the pen with the teeth, lips, or nondominant hand). The nonparametric cluster permutation test revealed significant happy and sad body-related EMMN (bEMMN) activities. The happy-bEMMN were more negative than sad-bEMMN within the range of 100–150 ms. Additionally, the bEMMN amplitude of both emotions is modulated by the facial feedback conditions. These results expand the range of emotional types applicable to bEMMN and provide evidence for the validity of the facial feedback hypothesis across emotional carriers.

众所周知，意外或变化的面部表情比频繁出现的面部表情能够进行更多的自动处理，从而引发称为表情失配负性（EMMN）的神经差分波反应。最近的研究表明，EMMN 可以通过观察者的面部反馈（即来自他们自己的面部运动的反馈）进行调节。身体表达也发现了类似的 EMMN 活动，但迄今为止只研究了几种情绪类型。目前尚不清楚身体表情引起的 EMMN 是否会受到面部反馈的影响。为了探索这个问题，我们以反向奇怪范式记录了 29 名参与者的脑电图活动。这里呈现了两种未经检查的身体表情类别，快乐和悲伤，放置在两个配对的刺激序列中：在一个刺激序列中，快乐的身体以 80% 的概率（标准）呈现，而悲伤的身体以 20% 的概率呈现（标准）。偏差），而在另一种情况下，概率是相反的。面部反馈是通过不同的握笔条件（即参与者用牙齿、嘴唇或非惯用手握笔）来操纵的。非参数聚类排列测试揭示了显着的快乐和悲伤身体相关 EMMN (bEMMN) 活动。在 100-150 ms 范围内，happy-bEMMN 比 Sad-bEMMN 更消极。此外，两种情绪的 bEMMN 幅度均受面部反馈条件的调节。这些结果扩大了适用于 bEMMN 的情绪类型范围，并为跨情绪载体的面部反馈假设的有效性提供了证据。