Pierrieau Emeline, Charissou Camille, Vernazza-Martin Sylvie, Pageaux Benjamin, Lepers Romuald, Amarantini David, Fautrelle Lilian
ToNIC, Toulouse NeuroImaging Center, Université de Toulouse, Inserm, Paul Sabatier University, Toulouse, France.
Aquitaine Institute for Cognitive and Integrative Neuroscience (INCIA), Université de Bordeaux, Bordeaux, France.
Front Hum Neurosci. 2024 Jan 5;17:1273435. doi: 10.3389/fnhum.2023.1273435. eCollection 2023.
Several studies in psychology provided compelling evidence that emotions significantly impact motor control. Yet, these evidences mostly rely on behavioral investigations, whereas the underlying neurophysiological processes remain poorly understood.
Using a classical paradigm in motor control, we tested the impact of affective pictures associated with positive, negative or neutral valence on the kinematics and patterns of muscle activations of arm pointing movements performed from a standing position. The hand reaction and movement times were measured and electromyography (EMG) was used to measure the activities from 10 arm, leg and trunk muscles that are involved in the postural maintenance and arm displacement in pointing movements. Intermuscular coherence (IMC) between pairs of muscles was computed to measure changes in patterns of muscle activations related to the emotional stimuli.
The hand movement time increased when an emotional picture perceived as unpleasant was presented as compared to when the emotional picture was perceived as pleasant. When an unpleasant emotional picture was presented, beta (β, 15-35 Hz) and gamma (γ, 35-60 Hz) IMC decreased in the recorded pairs of postural muscles during the initiation of pointing movements. Moreover, a linear relationship between the magnitude of the intermuscular coherence in the pairs of posturo-focal muscles and the hand movement time was found in the unpleasant scenarios.
These findings reveal that emotional stimuli can significantly affect the content of the motor command sent by the central nervous system to muscles when performing voluntary goal-directed movements.
心理学领域的多项研究提供了令人信服的证据，表明情绪会对运动控制产生重大影响。然而，这些证据大多依赖于行为学研究，而其潜在的神经生理过程仍知之甚少。
我们采用运动控制中的经典范式，测试了与正性、负性或中性效价相关的情感图片对从站立姿势进行手臂指向运动的运动学和肌肉激活模式的影响。测量了手部反应时间和运动时间，并使用肌电图（EMG）来测量参与姿势维持和指向运动中手臂位移的10块手臂、腿部和躯干肌肉的活动。计算肌肉对之间的肌间相干性（IMC），以测量与情绪刺激相关的肌肉激活模式的变化。
与被视为愉悦的情感图片相比，当呈现被视为不愉快的情感图片时，手部运动时间增加。当呈现不愉快的情感图片时，在指向运动开始时，记录的姿势肌肉对中的β（β，15 - 35Hz）和γ（γ，35 - 60Hz）IMC降低。此外，在不愉快的情境中，姿势焦点肌肉对中的肌间相干性大小与手部运动时间之间发现了线性关系。
这些发现表明，在进行自愿的目标导向运动时，情绪刺激会显著影响中枢神经系统向肌肉发送的运动指令的内容。
