Figure 5.

Association between acuity change and (A, B) fixation stability or (C, D) pupil size. (A) Comparison of observers’ BCEA following either no motion adaptation or receding motion adaptation. Each solid disc represents average data for each individual, and error bars represent ±1 SEM. We observe significantly poorer fixation stability following adaptation. (B) Fixation stability was not associated with substantially better acuity outcomes. (C) Comparison of pupil size following either unadapted or receding motion adaptation. Pupil size remained unchanged and (D) showed no significant link with acuity change. We found no evidence in support of the hypotheses that fixational eye movements and pupil size account for motion adaptation-induced gains in visual acuity.