Eye movements were untrained and not explicitly associated with reward. NEW & NOTEWORTHY Here we studied the eye-hand coordination of monkeys during flexible manual interception of a moving target. Our results reveal eye-hand coordination during manual interception, yet the eye and hand movements may show different levels of prediction based on the task context. Moreover, retinal errors and reaching errors were correlated across different stages of reach execution. Both hand and eye movements were modulated by target kinematics, and their reaction times were correlated. Before interception, the animals' gaze followed the targets with adequate compensation for the sensory delay, but not for extra target displacement during the eye movements. We found that well-trained animals were able to intercept the targets with adequate compensation for both sensory transmission and motor delays. Here, we trained gaze-unrestrained monkeys to manually intercept targets appearing at random locations and circularly moving with random speeds. In natural circumstances, active gaze shifts often accompany hand movements when exploring targets of interest, but how eye and hand movements are coordinated during manual interception and their dependence on visual prediction remain unclear. As a vital skill in an evolving world, interception of moving objects relies on accurate prediction of target motion.
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