Faculty of Psychology and Educational Sciences, Department of Psychology, University of Geneva, 40 Boulevard du Pont-d'Arve, CH-1211 Geneva, Switzerland; Neurology Unit, Medicine Department, Faculty of Sciences, University of Fribourg, Chemin du Musée 5, CH-1700 Fribourg, Switzerland; School of Philosophy, Psychology and Language Sciences, Department of Psychology, University of Edinburgh, 7 George Square, Edinburgh EH8 9JZ, UK.
Psychiatry Department, Division of Psychiatric Specialties, University Hospitals of Geneva, 20 bis rue de Lausanne, CH-1201 Geneva, Switzerland; NCCR Synapsy, 9 Chemin des Mines, CH-1202 Geneva, Switzerland.
Hum Mov Sci. 2018 Oct;61:151-166. doi: 10.1016/j.humov.2018.07.007. Epub 2018 Aug 8.
Sensorimotor synchronization (SMS) requires aligning motor actions to external events and represents a core part of both musical and dance performances. In the current study, to isolate the brain mechanisms involved in synchronizing finger tapping with a musical beat, we compared SMS to pure self-paced finger tapping and listen-only conditions at different tempi. We analyzed EEG data using frequency domain steady-state evoked potentials (SSEPs) to identify sustained electrophysiological brain activity during repetitive tasks. Behavioral results revealed different timing modes between SMS and self-paced finger tapping, associated with distinct scalp topographies, thus suggesting different underlying brain sources. After subtraction of the listen-only brain activity, SMS was compared to self-paced finger tapping. Resulting source estimations showed stronger activation of the left inferior frontal gyrus during SMS, and stronger activation of the bilateral inferior parietal lobule during self-paced finger tapping. These results point to the left inferior frontal gyrus as a pivot for perception-action coupling. We discuss our findings in the context of the ongoing debate about SSEPs interpretation given the variety of brain events contributing to SSEPs and similar EEG frequency responses.
感觉运动同步（SMS）需要将运动动作与外部事件对齐，是音乐和舞蹈表演的核心部分。在当前的研究中，为了分离与手指敲击音乐节拍同步相关的大脑机制，我们将 SMS 与纯自我节奏的手指敲击和只听条件进行了比较，在不同的节奏下进行了比较。我们使用频域稳态诱发电位（SSEPs）分析 EEG 数据，以识别在重复任务期间持续的电生理脑活动。行为结果揭示了 SMS 和自我节奏的手指敲击之间的不同定时模式，与不同的头皮拓扑结构相关，因此表明不同的潜在大脑来源。减去只听的大脑活动后，将 SMS 与自我节奏的手指敲击进行了比较。结果的源估计显示，在 SMS 期间左额下回的激活更强，而在自我节奏的手指敲击期间双侧顶下小叶的激活更强。这些结果表明左额下回是感知-动作耦合的关键。我们在讨论 SSEPs 解释的同时讨论了我们的发现，因为有多种大脑事件会影响 SSEPs 和类似的 EEG 频率响应。
