Cerebral averaged potentials preceding oral movement.
Cerebral averaged potentials preceding oral movement.
复制标题
口腔运动前的大脑平均电位。
DOI：
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发表时间：
1991
期刊：
影响因子：
--
通讯作者：
C. Larson
中科院分区：
文献类型：
--
作者：
A. Wohlert;C. Larson
“准备电位”是一种事件相关电位，在自愿的单侧肢体运动之前，在顶点和运动带头皮记录部位显示负性增加。虽然语音涉及运动的两侧中线，最近的录音的prespeech电位表明一种模式的双边激活，侧化的优势半球之前的发音运动的发病。为了确定这种模式的优势半球激活之前，一个刻板的，非言语运动的嘴，平均电位前唇突出任务记录在颅顶和左右运动皮层。结果进行了比较，由相同的主题进行的右手手指延伸任务之前的潜力。手指和嘴唇的运动最初都是由缓慢的负电位进行的。在手指伸展任务之前，负振幅在左侧运动皮层变得最大，运动侧的对侧。在嘴唇突出任务之前，电位的幅度甚至在左右运动皮层上保持不变。结果表明，这种中线结构的非言语运动，双边皮层控制发生。控制嘴唇运动显然不一定是大脑半球的优势功能，尽管优势可能成为更复杂运动的运动控制策略的一部分，例如在言语过程中使用的运动。
The "readiness potential" is an event-related potential that shows increasing negativity at vertex and motor strip scalp recording sites prior to voluntary, unilateral limb movements. Though speech involves movement on both sides of the midline, recent recordings of prespeech potentials suggest a pattern of bilateral activation that lateralizes to the dominant hemisphere just prior to the onset of articulatory movement. To determine whether this pattern of dominant hemisphere activation is present prior to a stereotyped, nonspeech movement of the mouth, the averaged potentials preceding a lip protrusion task were recorded at the cranial vertex and over the right and left motor cortex. Results were compared to potentials preceding a right finger extension task performed by the same subjects. Both the finger and the lip movements were initially preceded by slow negative potentials. Prior to the finger extension task, the negative amplitude became greatest over the left motor cortex, contralateral to the side of movement. Prior to the lip protrusion task, the amplitude of the potential remained even over the right and left motor cortices. The results suggest that, for this nonspeech movement of a midline structure, bilateral cortical control takes place. Control of lip movement is apparently not necessarily a dominant hemisphere function, though dominance may become part of the motor control strategy for more complex movements such as those used during speech.
影响因子：
3.7
作者：
FRIDLUND, AJ;CACIOPPO, JT
通讯作者：
CACIOPPO, JT