Schematic overview of trials used in the experiments.

<p>Both panels (A, B) represent the time course (x-axis) of the platform position (y-axis) used in the experiments. In both experiments, each experimental trial comprises two intervals lasting from 0-1s and 1-2s after platform motion onset respectively. In each interval, visual motion is presented (gray areas) between 0.25–0.75s after the start of the interval. It is therefore presented around the peak velocity of the vestibular stimulation. A. In experiment 1, radial optic flow that is either congruent (Cong) or incongruent (Incong) with the platform motion direction (forward) is presented in one interval, while in the other noise dots are presented. B. In experiment 2, leftward or rightward optic flow that is either congruent or incongruent with the platform motion (leftward) is presented in one interval, while in the other interval noise dots are presented. In both experiments, the presentation order of optic flow and noise dots intervals was counterbalanced across trials.