Abstract：
: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 approximately 3 Hz around a steady-state value. The average gain of smooth pursuit was approximately 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.
journal_name
J Neurophysioljournal_title
Journal of neurophysiologyauthors
de Brouwer S,Missal M,Lefèvre Pdoi
10.1152/jn.2001.86.2.550subject
Has Abstractpub_date
2001-08-01 00:00:00pages
550-8issue
2eissn
0022-3077issn
1522-1598journal_volume
86pub_type
杂志文章abstract：:According to Alexander's law (AL), the slow phase velocity of nystagmus of vestibular origin is dependent on horizontal position, with lower velocity when gaze is directed in the slow compared with the fast phase direction. Adaptive changes in the velocity-to-position neural integrator are thought to cause AL. Althoug...
journal_title：Journal of neurophysiology
pub_type： 杂志文章
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更新日期：2008-12-01 00:00:00
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journal_title：Journal of neurophysiology
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journal_title：Journal of neurophysiology
pub_type： 杂志文章
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更新日期：2007-02-01 00:00:00
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journal_title：Journal of neurophysiology
pub_type： 杂志文章
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更新日期：1990-05-01 00:00:00
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pub_type： 杂志文章
doi：10.1152/jn.1992.68.5.1867
更新日期：1992-11-01 00:00:00
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journal_title：Journal of neurophysiology
pub_type： 杂志文章
doi：10.1152/jn.1998.79.1.418
更新日期：1998-01-01 00:00:00
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journal_title：Journal of neurophysiology
pub_type： 杂志文章
doi：10.1152/jn.00594.2016
更新日期：2016-12-01 00:00:00
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pub_type： 杂志文章
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更新日期：2006-07-01 00:00:00
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journal_title：Journal of neurophysiology
pub_type： 杂志文章
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更新日期：2006-06-01 00:00:00
abstract：:1. Over two thirds of caudal medullary raphespinal neurons respond to electrical stimulation of the vestibular nerve, and it has been suggested that these neurons may participate in the generation of vestibulospinal and vestibulosympathetic reflexes. The objective of the present study was to determine which vestibular...
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更新日期：1993-09-01 00:00:00
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pub_type： 杂志文章
doi：10.1152/jn.1985.54.3.615
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更新日期：1985-01-01 00:00:00
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journal_title：Journal of neurophysiology
pub_type： 杂志文章
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更新日期：2001-05-01 00:00:00
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更新日期：2019-12-01 00:00:00
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更新日期：2008-01-01 00:00:00
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更新日期：2007-10-01 00:00:00
