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首页> 外文期刊>Progress in brain research >ERD/ERS patterns reflecting sensorimotor activation and deactivation.
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ERD/ERS patterns reflecting sensorimotor activation and deactivation.

机译：ERD / ERS模式反映了感觉运动的激活和失活。

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摘要

Oscillations in the alpha and beta band (<35 Hz) show characteristic spatiotemporal patterns during sensorimotor processing. Whereas event-related desynchronization (ERD) during motor preparation, execution, and imagery can be seen as a correlate of an activated cortical area, event-related synchronization (ERS) of frequency components between 10 and 13 Hz may represent a deactivated cortical area or inhibited cortical network, at least under certain conditions. Induced beta rhythms (13-35 Hz, beta ERS) can be found in sensorimotor areas following both voluntary movement and somatosensory stimulation. In a recent study we used different tasks involving execution and imagery of movements of the upper and lower limb to produce activation vs. deactivation/inhibition of the sensorimotor hand area. Sensorimotor interference, as a function of the activation level of the motor cortex, was studied by the use of repetitive median nerve stimulation (MNS) (ISI 1.5 s) in 12 healthy volunteers during the following task conditions: (i) cube manipulation between thumb and fingers of one hand, (ii) imagined cube manipulation, (iii) continuous foot rotation movements, and (iv) imagined foot movements. EEG was recorded from hand and foot representation areas and processed time-locked to MNS (ERD/ERS). In addition, task-related band power changes (TRPD/TRPI) were analyzed. We found a clear-cut suppression of the stimulation-induced beta ERS (indicating an enhanced activity state of the sensorimotor areas) during active cube manipulation and a weaker suppression during cube imagery. Mental imagination of foot movement led to an increase of the hand area mu rhythm, but did not interfere with stimulation-related effects on beta ERS. These findings support that interfering sensorimotor activation and deactivation is reflected in graduated changes of induced mu and beta oscillations.
机译：在感觉运动过程中，α和β波段（<35 Hz）中的振荡显示出特征性的时空模式。可以将运动准备，执行和成像过程中与事件相关的不同步（ERD）视为激活的皮质区域的相关性，而10和13 Hz之间的频率分量的事件相关的同步（ERS）则可以表示已禁用的皮质区域或至少在某些情况下会抑制皮层网络。自愿运动和体感刺激后，在感觉运动区域可发现诱导的β节律（13-35 Hz，βERS）。在最近的研究中，我们使用了涉及上肢和下肢运动的执行和运动图像的不同任务来产生感觉运动手区域的激活与失活/抑制。通过在以下任务条件下对12位健康志愿者进行重复正中神经刺激（MNS）（ISI 1.5 s），研究了感觉运动干扰与运动皮层激活水平的关系：（i）拇指之间的立方体操作和（ii）想象立方体操作，（iii）连续的脚旋转运动，以及（iv）想象的脚运动。从手和脚代表区域记录脑电图，并锁定到MNS（ERD / ERS）进行处理。此外，分析了与任务相关的频段功率变化（TRPD / TRPI）。我们发现在主动立方体操作过程中对刺激诱导的βERS的明确抑制（表明感觉运动区域的活动状态增强），而在立方体成像过程中抑制作用较弱。脚部运动的心理想象力导致手部面积节律的增加，但并未干扰刺激对βERS的影响。这些发现支持在诱导的mu和β振荡的逐步变化中反映了干扰的感觉运动激活和失活。

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