Figure 3.

Misattribution of optic flow vectors during concurrent self- and object-motion is exacerbated for eccentric targets and during passive rather than active self-motion. (a) Effect of target location. Perceived target velocity (y-axis, as estimated based on steering endpoint) as a function of true target velocity (x-axis), whether participants were moving (red; self-motion) or not (black; no self-motion) while the target was visible, and whether targets at onset were central (left) or eccentric (right). Circles represent means, error bars denote ±1 s.e.m., and pale dots in the background show data for individual subjects. (b) Impact of self-motion on perceived object velocity as a function of target location. Difference in perceived target velocity as a function of self-motion condition (self-motion − no self-motion; or red − black from (a), and whether targets were central (purple) or eccentric (green) at onset. Circles indicate means, error bars denote ±s.e.m., and pale dots in the background show data from individual subjects. (c) Active versus passive self-motion. Similar to (a), but panels are separated as a function of whether self-motion during target presentation was active (i.e. closed-loop; left, data are reproduced from figure 2d, right) or passive (i.e. open-loop; right). (d) Impact of active versus passive self-motion on perceived object velocity. Similar to (b), but separated according to whether self-motion during target presentation was active (purple) or passive (green).