Foot and hand area mu rhythms
Foot and hand area mu rhythms
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DOI：
10.1016/s0167-8760(97)00760-5
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发表时间：
1997-06-01
影响因子：
3
通讯作者：
Edlinger, G
中科院分区：
文献类型：
--
作者：
Pfurtscheller, G;Neuper, C;Edlinger, G
自发性脑电可以显示非同步或同步α带活动的时空模式。事件相关去同步（ERD）节律在α和低β波段是激活的皮层区域准备处理信息或准备运动的特征，而事件相关同步（ERS）在相同的频带可以看作是静息或空转皮层区域的电生理相关。在离散的手和脚运动中，对初级感觉运动区和前运动区进行脑电图研究。在手指运动时，在主要的手区发现ERD，在脚趾运动时，在主要的脚区发现ERD。前者在每一门学科中都存在，后者更难找到。从这些结果可以推测，每个初级感觉运动区域都有自己的内在节律，当相应的区域被激活时，这些节律就会变得不同步。ERS不仅在视觉处理过程中，而且在足部运动过程中也被观察到，以增强的mu节律形式出现在覆盖在主要手区的电极上。在这两种情况下，手部区域都不需要执行任务，因此可以被认为处于空转状态。辅助运动区（SMA）在运动准备和计划中也起着重要作用。研究表明，该区域也显示有节奏的活动在α波段，这是线性和非线性相耦合的固有（mu）节奏的主要手区。随着运动的计划和准备，这种SMA节奏被去同步，两个区域之间的耦合程度也降低了。(C) 1997爱思唯尔科学有限公司
Spontaneous EEG can display spatio-temporal patterns of desynchronized or synchronized alpha band activity. Event-related desynchronization (ERD) of rhythms within alpha and lower beta bands is characteristic of activated cortical areas ready to process information or to prepare a movement, while event-related synchronization (ERS) in the same frequency bands can be seen as an electrophysiological correlate of resting or idling cortical areas. EEG was investigated over primary sensorimotor and premotor areas during discrete hand and foot movements. ERD was found over the primary hand area during finger movement and over the primary foot area during toe movement. The former was observed in every subject, the latter was more difficult to find. From these results it can be speculated that each primary sensorimotor area has its own intrinsic rhythm, which becomes desynchronized when the corresponding area is activated. ERS, in the form of an enhanced mu rhythm on electrodes overlying the primary hand area, was observed not only during visual processing but also during foot movement. In both cases, the hand area is not needed to perform a task and, therefore, can be considered to be in an idling state. The supplementary motor area (SMA) also plays an important role in preparation and planning of movement. It is demonstrated that this area also displays rhythmic activity within the alpha band, that is both linearly and non-linearly phase coupled to the intrinsic (mu) rhythm of the primary hand area. With planning and preparation of movement, this SMA rhythm is desynchronized and also the degree of coupling between the two areas decreases. (C) 1997 Elsevier Science B.V.