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Differential controls over tactile detection in humans by motor commands and peripheral reafference.

机译:通过运动命令和外围干扰对人的触觉检测进行差分控制。

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摘要

The purpose of this study was to determine the extent to which motor commands and peripheral reafference differentially control the detection of near-threshold, tactile stimuli. Detection of weak electrical stimuli applied to the index finger (D2) was evaluated with two bias-free measures of sensory detection, the index of detectability (d') and the proportion of stimuli detected. Stimuli were presented at different delays prior to and during two motor tasks, D2 abduction, and elbow extension; both tasks were tested in two modes, active and passive. For both active tasks, the peak decrease in tactile suppression occurred at the onset of electromyographic activity. The time course for the suppression of detection during active and passive D2 abduction was identical, and preceded the onset of movement (respectively, -35 and -47 ms). These results suggest that movement reafference alone, acting through a mechanism of backward masking, could explain the modulation seen with D2 movement. In contrast, tactile suppression was significantly earlier for active elbow movements (-59 ms) as compared with passive (-21 ms), an observation consistent with both the motor command and peripheral reafference contributing to the suppression of detection of stimuli applied to D2 during movements about a proximal joint. A role for the motor command in tactile gating during distal movements cannot be discounted, however, because differences in the strength and distribution of the peripheral reafference may also have contributed to the proximo-distal differences in the timing of the suppression.
机译:这项研究的目的是确定运动命令和周围环境差异在多大程度上控制接近阈值的触觉刺激的检测。使用两种无偏差的感官检测措施,可检测性指标(d')和检测到的刺激物比例来评估施加到食指(D2)上的弱电刺激的检测。在两个运动任务(D2外展和肘部伸展)之前和期间,刺激以不同的延迟出现。两项任务均以主动和被动两种模式进行了测试。对于这两个活动任务,触觉抑制的峰值下降发生在肌电图活动开始时。在主动和被动D2外展期间抑制检测的时间过程是相同的,并且在运动开始之前(分别为-35和-47 ms)。这些结果表明,仅通过运动反向运动,通过后向掩蔽机制起作用,就可以解释D2运动所看到的调制。相比之下,主动肘部运动(-59 ms)的触觉抑制要比被动(-21 ms)显着更早,这一观察结果与运动命令和周围干扰一致,有助于抑制D2期间施加于D2的刺激。近端关节运动。然而,在远端运动过程中,运动命令在触觉门控中的作用不可小视,因为周围的强度和分布的差异也可能导致抑制时机的近距离差异。

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