Fig. 2.

Single-interval direction perception. Error bars represent 95 % CI. Positive values indicate the point of subjective equality or mean is shifted forward, and negative values indicate a backward shift. The final column in each panel (marked C) represents the mean data. a Single-interval vestibular direction determination. b Singleinterval visual direction determination from an optic flow stimulus with decreased coherence. c The width (sigma) of the cumulative distribution function. The coherence used for visual stimuli through-out the experiment in each subject is given as a number at the base of each bar