Figure 5.

Reduction in the amount of visual feedback minimizes age-associated differences in motor output variability during constant tasks. The top row demonstrates force variability at three different visual angles (lowest amount of visual feedback to the right) during constant isometric force tasks (data adapted from (25)). The bottom row demonstrates force variability at three different visual angles (lowest amount of visual feedback to the right) during constant position tasks (data adapted from (1)). Collectively, the findings suggest that lower amount of visual feedback minimizes (and in some cases, eliminates it — see lowest gain during the force task) the age-associated differences in force and positional variability during constant tasks.