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. 2016 Apr 22;6:24362. doi: 10.1038/srep24362

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Copyright © 2016, Macmillan Publishers Limited

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(A) Experimental setup. In all conditions, the participants (1) sat at a table in a standardized position (the body midline is shown as a yellow line) and completed 9 consecutive trials, each comprised of an induction and a pointing phase. In induction phases, the participants observed a visual reference (here shown as an orange circle) presented in the same position for all conditions. This reference consisted of a colored dot either attached to the index finger of a visible artificial hand (in “RHI sync” and “RHI async” conditions) (2) or to a thin metal rod (in “no hand” conditions). The RHI was elicited by tactile stimuli applied at the dorsum of the third digit using two soft brushes. The left hand (3) was occluded from sight by a vertical screen (dashed line). In pointing phases, the screen was turned over, covering the area indicated by solid black lines. Pointing movements were performed with the right hand (4) and closed eyes, starting at one of 9 starting positions (grey points) in randomized order. In the “RHI sync” and “RHI async” conditions, the participants rated the personal experience of the RHI using standard questions (see Table 1 in the methods section) at the end of each trial. The two experiments only differed with respect to the instructed target position: in the “target: artificial hand” experiment, the target position was identical to the reference position (orange circle); in the “target: real hand” experiment, the participants pointed at the corresponding position on the index finger of their real left hand (orange triangle); (B) Photos of the experimental setup. (a) A position sensor was attached to the index finger of the participants’ right hand to record the movements. (b) A visual reference (a colored dot) was either attached to an artificial hand (upper picture) or mounted on a thin metal rod with a height of 4.5 cm (lower picture), which allowed its presentation in the same location as in “RHI sync” and “RHI async” conditions (where it was attached to the artificial hand). (c) During the induction phases, a vertical board occluded the real hand from sight. (d) During the pointing phases, the same board was turned over, covering the area relevant for pointing movements.