Sample data from subject #1 during the combined visual-inertial heading discrimination task.

<p>The inertial stimulus included 0.15 cm vibration and visual heading was at 50% coherence. (A) The staircase with 25° leftward gaze. (B) Represents these same responses fit by a psychometric function. Subject’s responses are represented by circles scaled proportional to the number of stimulus presentations given at that heading with the largest circles representing 5 stimulus presentations and the smallest representing a single stimulus presentation. The curve represents the best fit to the data. The mean is shown with 95% confidence intervals. (C) The staircase with 25° rightward gaze. (D) Psychometric function fit to the responses in (C).