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首页> 外文期刊>Journal of Neurophysiology >Motor cost affects the decision of when to shift gaze for guiding movement
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Motor cost affects the decision of when to shift gaze for guiding movement

机译：电机成本影响何时改变凝视以获取引导运动的决定

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Frequent gait modifications are often required to navigate our world. These can involve long or wide steps or changes in direction. People generally prefer to minimize the motor cost (or effort) of a movement, although with changes in gait this is not always possible. The decision of when and where to shift gaze is critical for controlling motor actions, since vision informs the brain about the available choices for movement-in this case, where to step. Here we asked how motor cost influences the allocation of gaze. To address this, we had participants walk and step to the center of sequential targets on the ground. We manipulated the motor cost associated with controlling foot placement by varying the location of one target in the lateral direction on a trial-to-trial basis within environments with different numbers of targets. Costlier steps caused a switch from a gaze strategy of planning future steps to one favoring visual feedback of the current foot placement when participants had to negotiate another target immediately after. Specifically, costlier steps delayed gaze shifts away from the manipulated target. We show that this relates to the cost of moving the leg and redirecting the body's center of mass from target to target. Overall, our results suggest that temporal gaze decisions are affected by motor costs associated with step-to-step demands of the environment. Moreover, they provide insight into what affects the coordination between the eyes and feet for the control of stable and accurate foot placement while walking.
机译：常见的步态修改通常需要导航我们的世界。这些可以涉及长或宽的步骤或方向变化。人们一般宁愿尽量减少运动的电机成本（或努力），尽管具有步态的变化，但并不总是可能。何时何地转移凝视的决定对于控制电机行动至关重要，因为愿景向大脑通知大脑的运动选择 - 在这种情况下，在此处进行步骤。在这里，我们询问汽车成本如何影响凝视的分配。为了解决这个问题，我们参加了参与者走向地面上的顺序目标的中心。通过在具有不同数量的目标的环境中，通过改变横向方向上的一个目标的位置来操纵与控制脚放置相关联的电动机成本。 Costlier步骤导致从规划未来步骤的凝视策略到一个有利于当前脚放置的一个有利于当前脚踏时的视觉反馈，当参与者在后立即协商另一个目标时。具体而言，昂贵的步骤延迟凝视从操纵目标移位。我们表明这涉及移动腿的成本，并将身体的质量从目标重定向到目标。总体而言，我们的结果表明，与环境的步进需求相关的电机成本影响了时间凝视决策。此外，他们提供了深入了解眼睛和脚之间的协调，以控制稳定和准确的脚放置在行走时进行控制。

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