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J Neurophysiol (August 23, 2006). doi:10.1152/jn.00563.2006
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Submitted on May 26, 2006
Accepted on August 18, 2006

Predicting 2D target velocity cannot help 2D motion integration for smooth pursuit initiation

Anna Montagnini1, Miriam Spering2, and Guillaume S. Masson3*

1 Team DyVA - INCM - UMR6193, CNRS, Marseille, France
2 Experimental Psychology, Justus-Liebig-Universität Gießen, Giessen, Germany
3 Team DyVA - INCM - UMR6193, CNRS, Marseille, France

* To whom correspondence should be addressed. E-mail: guillaume.masson{at}incm.cnrs-mrs.fr.

Smooth pursuit eye movements reflect the temporal dynamics of bidimensional (2D) visual motion integration. When tracking a single, tilted line, initial pursuit direction is biased toward unidimensional (1D) edge motion signals, which are orthogonal to the line orientation. Over 200ms, tracking direction is slowly corrected to finally match the 2D object motion during steady-state pursuit. We now show that repetition of line orientation and/or motion direction does not eliminate the transient tracking direction error nor change the time course of pursuit correction. Nonetheless, multiple successive presentations of a single orientation/direction condition elicit robust anticipatory pursuit eye movements that always go in the 2D object motion direction, not the 1D edge motion direction. These results demonstrate that predictive signals about target motion cannot be used for an efficient integration of ambiguous velocity signals at pursuit initiation.







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