Divided attention impairs human motor adaptation but not feedback control
Divided attention impairs human motor adaptation but not feedback control
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DOI：
10.1152/jn.01070.2006
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发表时间：
2007-07-01
影响因子：
2.5
通讯作者：
Thoroughman, Kurt A.
中科院分区：
文献类型：
--
作者：
Taylor, Jordan A.;Thoroughman, Kurt A.
当人类在运动中遇到外部引起的错误时，运动系统的反馈控制会补偿运动中的这些错误。然后，运动系统的预测控制使用有关这些错误的信息来通知未来的运动。注意力在这两种不同的运动过程中的作用尚不清楚。先前的实验已经揭示了注意力在许多运动过程中的运动学习中的作用;然而，这些实验范式并不能确定注意力如何影响运动内反馈控制与跨运动适应。在这里，我们开发了一个双任务范式，包括运动和音频任务，它可以区分和揭示注意在这两个过程中的运动控制的作用。在几天的时间里，受试者进行水平伸展运动，有和没有音频任务;运动偶尔会受到瞬态力扰动。在运动与力扰动，科目补偿力引起的运动误差，并在运动后立即力扰动科目表现出适应。在每一个运动试验中，受试者都要完成一个双音频率辨别任务。频率辨别任务的时间特异性使我们能够在运动内部和运动之间分配注意力。我们发现，分散注意力并没有损害内运动反馈控制的手臂，但减少随后的运动适应。我们认为，次要任务干扰编码和转换的错误预测控制的变化。
When humans experience externally induced errors in a movement, the motor system's feedback control compensates for those errors within the movement. The motor system's predictive control then uses information about those errors to inform future movements. The role of attention in these two distinct motor processes is unclear. Previous experiments have revealed a role for attention in motor learning over the course of many movements; however, these experimental paradigms do not determine how attention influences within-movement feedback control versus across-movement adaptation. Here we develop a dual-task paradigm, consisting of movement and audio tasks, which can differentiate and expose attention's role in these two processes of motor control. Over the course of several days, subjects performed horizontal reaching movements, with and without the audio task; movements were occasionally subjected to transient force perturbations. On movements with a force perturbation, subjects compensated for the force-induced movement errors, and on movements immediately after the force perturbation subjects exhibited adaptation. On every movement trial, subjects performed a two-tone frequency-discrimination task. The temporal specificity of the frequency-discrimination task allowed us to divide attention within and across movements. We find that divided attention did not impair the within-movement feedback control of the arm, but did reduce subsequent movement adaptation. We suggest that the secondary task interfered with the encoding and transformation of errors into changes in predictive control.