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. 2017 Feb 5;2017(1):niw025. doi: 10.1093/nc/niw025

Figure 1.

Figure 1

We conducted three VR experiments where participants had to perform a pre-trained hand movement. We monitored the coordinates of the hand using a novel hand-tracking device, while the hand was kept invisible for the participant. A) Illustration of the physical setup of the experiment: The participants were sitting behind a desk and had to make a pre-trained hand movement while the hand was kept invisible in the VR environment. The coordinates of the hand were monitored and moving targets were presented behind the (invisible) moving hand. The left hand is shown in two positions. B) An illustrative view of the VR environment. In the critical condition, the targets were chosen from behind the (invisible) moving hand (position "“H1” for clarity, the hand contour, the area behind the hand, and an example random target are illustrated in green). In control conditions, the targets were shown either in the area reflected from the fixation point (“Ref ”), or the hand was moved to the left (“H2” position) while the targets were still presented as if the hand would have been in the position H1. C) Illustrative overview of the experimental design. After a red “go” signal, the participants performed a pre-learned hand movement. The target object was chosen from the area behind the invisible moving hand (for visual clarity, green in the figure) and the participants had to react as fast as possible when they noticed the target. Note that the figure is illustrative: the objects (except the targets of E3) and the hand were neither colored, visible, nor outlined for the participant, and the targets were much smaller (see Fig. 1B).