Motor- and pain-related processes separately induce a reduction in alpha and beta power. When movement and pain occur simultaneously but are independent of each other, the effects on alpha and beta power are additive. It is not clear whether this additive effect is evident during motor-evoked pain in individuals with chronic pain. We combined highdensity electroencephalography (EEG) with a paradigm in which motor-evoked pain was induced during a jaw force task. Participants with chronic jaw pain and pain-free controls produced jaw force at 2% and 15% of their maximum voluntary contraction. The chronic jaw pain group showed exacerbated motor-evoked pain as force amplitude increased and showed increased motor variability and motor error irrespective of force amplitude. The chronic jaw pain group had an attenuated decrease in power in alpha and lower-beta frequencies in the occipital cortex during the anticipation and experience of motor-evoked pain. Rather than being additive, motor-evoked pain attenuated the modulation of alpha and beta power, and this was most evident in occipital cortex. Our findings provide the first evidence of changes in neural oscillations in the cortex during motor-evoked jaw pain.

运动和疼痛相关过程分别引起α和β功率的降低。当运动和疼痛同时发生但彼此独立时，对 alpha 和 beta 功率的影响是相加的。尚不清楚这种累加效应在慢性疼痛个体的运动诱发疼痛期间是否明显。我们将高密度脑电图 (EEG) 与在下颌力任务期间诱发运动诱发疼痛的范例相结合。患有慢性下颌疼痛和无痛控制的参与者在最大自主收缩的 2% 和 15% 下产生下颌力。慢性下颌疼痛组显示出随着力幅增加而加剧的运动诱发性疼痛，并显示出增加的运动变异性和运动误差，而与力幅无关。慢性下颌疼痛组在预期和经历运动诱发性疼痛期间，枕叶皮层中 α 和低 β 频率的功率减弱。运动诱发的疼痛不是累加性，而是减弱了 α 和 β 功率的调制，这在枕叶皮层中最为明显。我们的研究结果提供了运动诱发下颌疼痛期间皮层神经振荡变化的第一个证据。