Figure 1.
The production–reproduction task. a, Temporal sequence of events in each test trial. Participants had to produce and subsequently reproduce a certain displacement in the VR by using the joystick. Depending on the session, participants walked on a linear path (DE) or turned on the spot (AE) until they were automatically stopped after a certain displacement, dp or αp, respectively. Next, participants were instructed to reproduce the same amount of perceived displacement while keeping the direction of movement constant. Participants indicated that they reached their final position by a button press. This estimated displacement is referred to as dr in DE sessions and αr in AE sessions. b, DE and AE were tested separately under three different conditions that differed only in the underlying uniform sample distribution (small displacements, intermediate displacements, and large displacements range, for DE: turquoise, light blue, and dark blue, respectively; for AE: bright green, olive, dark green, respectively) from which the production displacements dp and αp were drawn.