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Visual selective attention and the control of tracking eye movements: A critical review

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journal contribution
posted on 2021-04-23, 13:45 authored by David Souto, Dirk Kerzel
People's eyes are directed at objects of interest with the aim of acquiring visual information. However, processing this information is constrained in capacity, requiring task-driven and salience-driven attentional mechanisms to select few among the many available objects. A wealth of behavioural and neurophysiological evidence has demonstrated that visual selection and motor selection of saccade targets rely on shared mechanisms. This coupling supports the premotor theory of visual attention put forth more than 30 years ago, postulating visual selection as a necessary stage in motor selection. We examine to which extent the coupling of visual and motor selection observed with saccades is replicated during ocular tracking. Ocular tracking combines catch-up saccades and smooth pursuit to foveate a moving object. We find evidence that ocular tracking requires visual selection of the speed and direction of the moving target, but the position of the motion signal may not coincide with the position of the pursuit target. Further, visual and motor selection can be spatially decoupled when pursuit is initiated (open-loop pursuit). We propose that a main function of coupled visual and motor selection is to serve the coordination of catch-up saccades and pursuit eye movements. A simple race-to-threshold model is proposed to explain the variable coupling of visual selection during pursuit, catch-up and regular saccades, while generating testable predictions. We discuss pending issues, such as disentangling visual selection from pre-attentive visual processing and response selection, and the pinpointing of visual selection mechanisms, which have begun to be addressed in the neurophysiological literature.

History

Author affiliation

Department of Neuroscience, Psychology and Behaviour, College of Life Sciences

Version

  • AM (Accepted Manuscript)

Published in

Journal of neurophysiology

Publisher

American Physiological Society

issn

0022-3077

eissn

1522-1598

Acceptance date

2021-02-01

Copyright date

2021

Available date

2022-03-17

Spatial coverage

United States

Language

eng

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