Fig 1. Experimental setting and procedure of the applied Aperture Task.

(A) Experimental setting included Aperture apparatus, button-pad, goggles (here: opaque). (B) The exemplary image above shows the setting for RBD patients (judging whether their right hand would fit into the aperture). The exemplary image below shows the setting for LBD patients (judging whether their left hand would fit into the aperture). (C) Overview of the procedure in Session 1 and Session 2. The numbers in brackets represent the number of trials within each block. Note that two additional extreme demonstration trials preceded each experimental block. Please note that contralesional hand judgments (shown grayed out) are not of specific interest for the present study and are not included in the data analysis. Note. The used material is identical to the material presented in our previous study [8]. The here displayed illustrations were photographed by Isabel Bauer.