Rapid Responses to Reach Errors are Equally Strong During Fixation and Visual Pursuit

When reaching to a foveated target, peripheral vision of the hand can be used to make rapid, automatic adjustments to the ongoing reach movement, with feedback gain being sensitive to features of the task and environment. These rapid corrective responses are also observed when gaze is directed to a stationary ‘gaze’ target located away from the reach target. In everyday contexts, reaching often occurs concurrently with other visual or visuomotor tasks, such as tracking a moving target. Yet it remains unclear whether engaging in such tasks affects the use of peripheral vision for hand guidance. Here, we compare rapid visuomotor corrective responses to visual perturbations during fixation and smooth pursuit, and test whether pursuit-related and reach-related visuomotor processes operate independently or compete for shared visual resources. Participants either fixated a stationary target or tracked a moving target while reaching toward a spatially dissociated reach target. During the reach, the visual representation of the hand was perturbed, requiring rapid corrective responses. We found that neither the onset nor the gain of reach corrections was modulated by gaze-task demands. Moreover, response gains were strongly correlated across tasks, indicating consistent individual response profiles that were independent of the gaze condition. Although participants remained engaged in the smooth pursuit task, their performance slightly declined during reaching compared to the preparatory period. Together, these findings demonstrate that rapid, automatic visual feedback mechanisms during reaching are equally robust during pursuit tracking and fixation of a separate gaze target.