The subjects were asked to use their free right hand point with a baton to the location of each knuckle and fingertip of their left hand.

实验对象被要求用他们空出来的右手拿着一根指挥棒，指出他们左手每个指关节和指尖的位置。

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Think of a mechanical hand where the knuckle joints and the actuators for those joints are integrated right in the joints themselves.

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