Figure 4.

(A) Peak horizontal saccade velocity—which theoretically should not be affected by musculoskeletal mechanisms and processes—decreases with age. Figure created based on estimated values from Irving et al. (61). This article did not report specific pairwise comparisons across groups, but a group main effect was observed, denoted here with an asterisk. (B) Older adults with depression (n = 16) and slow gait speed were given a 3-week treatment with carbidopa/levodopa (L-DOPA), which resulted in significant improvement in single- and dual-task usual gait speed (37.5 mg carbidopa/150 mg levodopa once daily for the first week, twice a day for the second week, and 3 times a day for the third week). Figure created from data presented by Rutherford et al. (62).