Smooth pursuit operates over perceived not physical positions of the double-drift stimulus.

ABSTRACT: The double-drift illusion produces a large deviation in perceived direction that strongly dissociates physical position from perceived position. Surprisingly, saccades do not seem to be affected by the illusion (Lisi & Cavanagh, 2015). When targeting a double-drift stimulus, the saccade system is driven by retinal rather than perceived position. Here, using paired double-drift targets, we test whether the smooth pursuit system is driven by perceived or physical position. Participants (n = 7) smoothly pursued the inferred midpoint (Steinbach, 1976) between two horizontally aligned Gabor patches that were separated by 20° and moving on parallel, oblique paths. On the first half of each trial, the Gabors' internal textures were static while both drifted obliquely downward. On the second half

SUBMITTER: Maechler MR 

PROVIDER: S-EPMC8504195 | biostudies-literature | 2021 Oct

REPOSITORIES: biostudies-literature