In a demanding task, three-handed manipulation is preferred to two-handed manipulation.
In a demanding task, three-handed manipulation is preferred to two-handed manipulation.
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DOI：
10.1038/srep21758
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发表时间：
2016-02-25
影响因子：
4.6
通讯作者：
Bleuler H
中科院分区：
文献类型：
--
作者：
Abdi E;Burdet E;Bouri M;Himidan S;Bleuler H
配备了第三只手在他们的直接控制下，外科医生可能能够单独执行某些手术干预;这将减少对人类助手的需求和相关的协调困难。然而，人类的表现是否比两只手更好？为了评估这种可能性，我们进行了一项行为研究的表现天真的成年人捕捉物体与三个虚拟的手控制他们的双手和右脚。受试者可以在几次试验中成功地控制虚拟手。在这种控制策略下，手的工作空间与任务速度呈负相关。三只手和双手控制的性能比较显示，在任务过程中，在抓落物的成功率和平均努力没有显着差异。受试者更喜欢三手控制策略，发现它更容易，身体和精神负担更少。虽然脚与自然手的协调性在一次又一次的试验中得到了提高，但大约两分钟的练习不足以培养对第三只手臂的主人翁感。
Equipped with a third hand under their direct control, surgeons may be able to perform certain surgical interventions alone; this would reduce the need for a human assistant and related coordination difficulties. However, does human performance improve with three hands compared to two hands? To evaluate this possibility, we carried out a behavioural study on the performance of naive adults catching objects with three virtual hands controlled by their two hands and right foot. The subjects could successfully control the virtual hands in a few trials. With this control strategy, the workspace of the hands was inversely correlated with the task velocity. The comparison of performance between the three and two hands control revealed no significant difference of success in catching falling objects and in average effort during the tasks. Subjects preferred the three handed control strategy, found it easier, with less physical and mental burden. Although the coordination of the foot with the natural hands increased trial after trial, about two minutes of practice was not sufficient to develop a sense of ownership towards the third arm.