Unsupervised learning of the trajectory of a moving visual target and evolution of its tracking in the non-human primate - Archive ouverte HAL
Poster De Conférence Année : 2015

Unsupervised learning of the trajectory of a moving visual target and evolution of its tracking in the non-human primate

Résumé

An object moving in the visual field triggers a saccade that brings its image onto the fovea. It is followed by a combination of slow pursuit eye movements and catch-up saccades that keep the target image onto the fovea as long as possible. The accuracy of this ability to track the “here-and-now” location of a target contrasts with the distributed nature of the encoding processes in the brain and the variable sensorimotor delays. We studied how this performance is acquired in 6 inexperienced rhesus monkeys that we recorded during consecutive sessions. During the early exposure, the tracking is surprisingly mostly saltatory, made of saccades separated by low eye velocity episodes, demonstrating that smooth pursuit is not a spontaneous response to a moving stimulus. A joint evolution of saccade and pursuit components is observed. Across sessions, the tracking becomes less discontinuous and the smooth pursuit more prominent. This smoothing is observed at several scales, across the time course of each trial, trial repetitions and consecutive training sessions. We explain how saccades facilitate the evolution of smooth pursuit, even in the absence of stringent training constraints. Our findings create new perspectives for studying in the oculomotor system the neural mechanisms underlying implicit visuomotor learning and synchronization.
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Dates et versions

hal-04378534 , version 1 (08-01-2024)

Identifiants

  • HAL Id : hal-04378534 , version 1

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Clara Bourrelly, Julie Quinet, Patrick Cavanagh, Laurent Goffart. Unsupervised learning of the trajectory of a moving visual target and evolution of its tracking in the non-human primate. From humans and non-human primates to robots: Motion, Dec 2015, Rousset-sur-Arc, France. ⟨hal-04378534⟩

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