Brevity of haptic force perturbations induces heightened adaptive sensitivity.
Brevity of haptic force perturbations induces heightened adaptive sensitivity.
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DOI：
10.1007/s00221-013-3450-3
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发表时间：
2013-05
影响因子：
2
通讯作者：
Thoroughman, Kurt A.
中科院分区：
文献类型：
--
作者：
Wanda, Paul A.;Fine, Michael S.;Weeks, Heidi M.;Gross, Andrew M.;Macy, Jenny L.;Thoroughman, Kurt A.
我们将人类参与者暴露在全运动和脉动粘性力扰动下，以研究力持续时间对感觉到适应的增量转化的影响。运动生物力学的传统观点可能认为，脉动力将在很大程度上被衰减，因为刚度和粘度充当自然的低通滤波器。然而，感觉传导倾向于对刺激的变化做出反应，因此可能是对短暂的脉动力的高度敏感性的基础。在这里，参与者适应扰动持续时间条件内的方式成比例感测力和位置误差。在扰动条件下，我们发现参与者在经历脉动力而不是全运动力时具有更大的适应灵敏度。在后续的实验中，我们采用错误钳位，力通道试验，以确定预测力产生的变化。我们发现，虽然参与者学会了密切补偿全运动力的幅度和宽度，但他们在适应的运动输出和经历的脉动力之间的幅度和宽度上表现出持续的不匹配。这种不匹配可能产生误差信号的更高显著性，这有助于提高对脉动力的灵敏度。
We have exposed human participants to both full-movement and pulsatile viscous force perturbations to study the effect of force duration on the incremental transformation of sensation into adaptation. Traditional views of movement biomechanics could suggest that pulsatile forces would largely be attenuated as stiffness and viscosity act as a natural low-pass filter. Sensory transduction, however, tends to react to changes in stimuli and therefore could underlie heightened sensitivity to briefer, pulsatile forces. Here, participants adapted within perturbation duration conditions in a manner proportionate to sensed force and positional errors. Across perturbation conditions, we found participants had greater adaptive sensitivity when experiencing pulsatile forces rather than full-movement forces. In a follow-up experiment, we employed error-clamped, force channel trials to determine changes in predictive force generation. We found that while participants learned to closely compensate for the amplitude and breadth of full-movement forces, they exhibited a persistent mismatch in amplitude and breadth between adapted motor output and experienced pulsatile forces. This mismatch could generate higher salience of error signals that contribute to heightened sensitivity to pulsatile forces.
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