求翻译：让受试者的一只手轻放在桌面手心向下，使中指轻轻地搭在指脉换能器感受片上。让受试者保持舒适的姿势，这样不会因为除了电刺激外的其他因素晃动手臂。如下图所示是什么意思？

The subjects of one hand light on the table palms down, so that the middle finger to gently ride feel the piece refers to the pulse transducer. Subjects to maintain a comfortable posture, so as not shaking arm in addition to other factors outside of the electrical stimulation. As shown below

Let the subject of only a very softly on the desktop palm down, and the middle finger to the ground gently Pulse transducer feel on-chip. Let the subject comfortable position, so that electrical stimulation in addition will not be because of other factors outside swing arm. As shown in the figure be

Let handle gently trying one places the tabletop control downward, causes the middle finger to build gently in takes the pulse on the transducer feeling piece.Let the trying maintenance comfortable posture, like this cannot because rocks the arm besides the electricity stimulation other factors.The

Participants have a light hand on the desktops of Palm down, middle fingers gently upon the on-chip pulse transducers. Volunteers maintain comfortable posture so that you do not because of other factors in addition to electrical stimulation of swing arm. As shown in the following figure

正在翻译，请等待...