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Attentional sensitivity and asymmetries of vertical saccade generation in monkeyThe first goal of this study was to systematically document asymmetries in vertical saccade generation. We found that visually guided upward saccades have not only shorter latencies, but higher peak velocities, shorter durations and smaller errors. The second goal was to identify possible mechanisms underlying the asymmetry in vertical saccade latencies. Based on a recent model of saccade generation, three stages of saccade generation were investigated using specific behavioral paradigms: attention shift to a visual target (CUED paradigm), initiation of saccade generation (GAP paradigm) and release of the motor command to execute the saccade (DELAY paradigm). Our results suggest that initiation of a saccade (or "ocular disengagement") and its motor release contribute little to the asymmetry in vertical saccade latency. However, analysis of saccades made in the CUED paradigm indicated that it took less time to shift attention to a target in the upper visual field than to a target in the lower visual field. These data suggest that higher attentional sensitivity to targets in the upper visual field may contribute to shorter latencies of upward saccades.
Document ID
Document Type
Reprint (Version printed in journal)
Zhou, Wu (University of Mississippi Medical Center 2500 North State Street, Jackson, MS 39216-4505, United States)
King, W. M.
Shelhamer, M. J.
Date Acquired
August 21, 2013
Publication Date
March 1, 2002
Publication Information
Publication: Vision research
Volume: 42
Issue: 6
ISSN: 0042-6989
Subject Category
Life Sciences (General)
Funding Number(s)
Distribution Limits
NASA Discipline Neuroscience
Non-NASA Center