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The Journal of Neurophysiology Vol. 86 No. 2 August 2001, pp. 550-558
Copyright ©2001 by the American Physiological Society
1Center for Systems Engineering and Applied Mechanics, Université Catholique de Louvain, 1348 Louvain-la-Neuve; and 2Laboratory of Neurophysiology, Université Catholique de Louvain, 1200 Brussels, Belgium
de Brouwer, Sophie,
Marcus Missal, and
Philippe Lefèvre.
Role of Retinal Slip in the Prediction of Target Motion During
Smooth and Saccadic Pursuit. J. Neurophysiol. 86: 550-558, 2001. Visual tracking of moving targets
requires the combination of smooth pursuit eye movements with catch-up
saccades. In primates, catch-up saccades usually take place only during
pursuit initiation because pursuit gain is close to unity. This
contrasts with the lower and more variable gain of smooth pursuit in
cats, where smooth eye movements are intermingled with catch-up
saccades during steady-state pursuit. In this paper, we studied in
detail the role of retinal slip in the prediction of target motion
during smooth and saccadic pursuit in the cat. We found that the
typical pattern of pursuit in the cat was a combination of smooth eye movements with saccades. During smooth pursuit initiation, there was a
correlation between peak eye acceleration and target velocity. During
pursuit maintenance, eye velocity oscillated at ~3 Hz around a
steady-state value. The average gain of smooth pursuit was ~0.5. Trained cats were able to continue pursuing in the absence of a visible
target, suggesting a role of the prediction of future target motion in
this species. The analysis of catch-up saccades showed that the
smooth-pursuit motor command is added to the saccadic command during
catch-up saccades and that both position error and retinal slip are
taken into account in their programming. The influence of retinal slip
on catch-up saccades showed that prediction about future target motion
is used in the programming of catch-up saccades. Altogether, these
results suggest that pursuit systems in primates and cats are
qualitatively similar, with a lower average gain in the cat and that
prediction affects both saccades and smooth eye movements during pursuit.
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