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首页> 外文期刊>The Journal of Neuroscience: The Official Journal of the Society for Neuroscience >Distinct Modulations in Sensorimotor Postmovement and Foreperiod beta-Band Activities Related to Error Salience Processing and Sensorimotor Adaptation
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Distinct Modulations in Sensorimotor Postmovement and Foreperiod beta-Band Activities Related to Error Salience Processing and Sensorimotor Adaptation

机译：与误差显着处理和Sensimotor适应有关的感觉电流术课程和前一β频段活动的不同调制

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In a recent study, Tan et al. (2014a,b) showed that the increase in beta-power typically observed after a movement above sensorimotor regions (beta-rebound) is attenuated when movement-execution errors are induced by visual perturbations. Moreover, akin to sensorimotor adaptation, the effect depended on the context in which the errors are experienced. Thus the beta-rebound attenuation might relate to neural processes involved in trial-to-trial adaptive mechanisms. In two EEG experiments with human participants, along with the beta-rebound, we examine beta-activity during the preparation of reaches immediately following perturbed movements. In the first experiment, we show that both foreperiod and postmovement beta-activities are parametrically modulated by the sizes of kinematic errors produced by unpredictable mechanical perturbations (force field) independent of their on-line corrections. In the second experiment, we contrast two types of reach errors: movement-execution errors that trigger trial-to-trial adaptive mechanisms and goal errors that do not elicit sensorimotor adaptation. Movement-execution errors were induced by mechanical or visual perturbations, whereas goal errors were caused by unexpected displacements of the target at movement initiation. Interestingly, foreperiod and postmovement beta-activities exhibit contrasting patterns, pointing to important functional differences of their underlying neuronal activity. While both types of reach errors attenuate the postmovement beta-rebound, only the kinematic errors that trigger trial-to-trial motor-command updates influenced beta-activity during the foreperiod. These findings suggest that the error-related modulation of the beta-rebound may reflect salience processing, independent of sensorimotor adaptation. In contrast, modulations in the foreperiod beta-power might relate to the motor-command adjustments activated after movement-execution errors are experienced.
机译：在最近的一项研究中，Tan等人。 （2014A，B）表明，当通过视觉扰动引起运动执行误差时，衰减在感觉电流区域（Beta-Rebound）上方的运动之后通常观察到的β功率的增加。此外，类似于SensorImotor适应，效果取决于所经历错误的上下文。因此，β反弹衰减可能涉及涉及试验自适应机制的神经过程。在两个与人类参与者的EEG实验中，随着β反弹，我们在扰动运动后立即达到达到达到的赌注期间检查β-活性。在第一个实验中，我们表明，前偶联和预测β-活动都是通过不可预测的机械扰动（力场）而产生的运动误差的大小调制，与其在线校正无关。在第二个实验中，我们对比两种类型的覆盖错误：移动执行错误，触发不引出感觉运动器适应的试验自适应机制和目标误差。通过机械或视觉扰动引起运动执行误差，而目标误差是由运动启动的目标意外移位引起的。有趣的是，前肢体和预测β-活动表现出对比模式，指出其潜在的神经元活动的重要功能差异。虽然这两种类型的覆盖错误都衰减了课程β反弹，但只有触发试验到试次电动机命令更新的运动错误，影响了前翅期间的β-活动。这些发现表明，β反弹的误差调制可能反映了显着处理，独立于传感器适应。相比之下，前端β功率中的调制可能与运动执行错误发生后激活的电机指令调整可能涉及。

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