Colliding saccades evoked by frontal eye field stimulation: artifact or evidence for an oculomotor compensatory mechanism underlying double-step saccades?

被引:0
作者
Peter Ford Dominey
John Schlag
Madeleine Schlag-Rey
Michael A. Arbib
机构
[1]  Vision et Motricité,
[2] INSERM Unité 94,undefined
[3] F-69500 Bron,undefined
[4] France,undefined
[5]  Institut des Sciences Cognitives – EP100 – CNRS,undefined
[6] F-69008 Lyon,undefined
[7] France,undefined
[8]  Brain Research Institute and Department of Anatomy and Cell Biology,undefined
[9] University of California,undefined
[10] Los Angeles,undefined
[11] CA 90024,undefined
[12] USA,undefined
[13]  Center for Neural Engineering,undefined
[14] University of Southern California,undefined
[15] Los Angeles,undefined
[16] CA 90089-2520,undefined
[17] USA,undefined
来源
Biological Cybernetics | 1997年 / 76卷
关键词
Compensatory Mechanism; Position Change; Retinal Image; Transmission Delay; Position Information;
D O I
暂无
中图分类号
学科分类号
摘要
 What happens when the goal is changed before the movement is executed? Both the double-step and colliding saccade paradigms address this issue as they introduce a discrepancy between the retinal images of targets in space and the commands generated by the oculomotor system necessary to attain those targets. To maintain spatial accuracy under such conditions, transformations must update ‘retinal error’ as eye position changes, and must also accommodate neural transmission delays in the system so that retinal and eye position information are temporally aligned. Different hypotheses have been suggested to account for these phenomena, based on observations of dissociable cortical and subcortical compensatory mechanisms. We now demonstrate how a single compensatory mechanism can be invoked to explain both double-step and colliding saccade paradigm results, based on the use of a damped signal of change in position that is used in both cases to update retinal error and, thereby, account for intervening movements. We conclude that the collision effect is not an artifact, but instead reveals a compensatory mechanism for saccades whose targets appear near the onset of a preceding saccade.
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页码:41 / 52
页数:11
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