OBJECTIVE The current study sought to determine whether there is a Bereitschaftspotential (BP) before uninstructed, spontaneous movements. METHODS 14 participants were seated on a comfortable armchair for one hour without any instruction except not to fall asleep and to keep their eyes open. Electroencephalography (EEG) and electromyography (EMG) activity were recorded during the whole session. EEG activity was analyzed before spontaneous movements and compared with EEG activity before repetitive, instructed movements in a separate session. RESULTS BPs were identified in most participants with the spontaneous movements. The BPs with spontaneous movements were mostly localized in the medial frontocentral regions. The BPs with the instructed movements were localized primarily in the central regions and had larger amplitude. CONCLUSION Presence of a BP before movement does not depend on instruction and may be independent of conscious volition. The amplitude of the BP may depend on the amount of attention. SIGNIFICANCE This study shows that the presence of a BP before movement is not an "artifact" of the experimental instructions.

中文翻译：

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自发运动的大脑准备：脑电图研究

目标当前的研究试图确定在无指导的自发运动之前是否存在 Bereitschaftspotential (BP)。方法 14 名参与者坐在舒适的扶手椅上一小时，除了不要入睡和睁开眼睛外，没有任何指示。在整个会议期间记录脑电图 (EEG) 和肌电图 (EMG) 活动。在自发运动之前分析 EEG 活动，并在单独的会话中与重复、指示性运动之前的 EEG 活动进行比较。结果 在大多数有自发运动的参与者中发现了 BP。自发运动的BP主要位于内侧额中央区域。具有指示运动的BP主要位于中心区域并且具有较大的幅度。结论 运动前血压的存在不依赖于指导，可能与有意识的意志无关。BP 的幅度可能取决于注意力的大小。意义 这项研究表明，运动前血压的存在并不是实验指令的“人工制品”。