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Cited by 62Visual perception and processing mechanismsMotor Control and AdaptationVisual Attention and Saliency Detection

Properties of Saccadic Responses in Monkey When Multiple Competing Visual Stimuli Are Present

Arai, Kuniharu, McPeek, Robert M., Keller, Edward L.·2004·Journal of Neurophysiology
DOI 10.1152/jn.00818.2003
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Abstract

Important insights into the neural organization of the saccadic system have been gained when the usually stereotyped movement trajectories of saccades have been altered by experimental manipulation. In the present study we produced trajectory variability in monkeys by using a visual search task in which both the location and color of an odd-colored target were changed randomly trial by trial, and the number of distractors was varied on each trial. We wished to determine whether increasing the number of distractors also increased the movement trajectory variation, i.e., the amount of initial directional deviation, endpoint deviation (averaging), and curvature of saccades. Overall, saccade latencies and the proportion of saccades directed to distractors decreased as the number of homogenous distractors increased. We also found that saccades have much more dispersion in their initial direction when distractors are present in comparison to the case when only a single target without distractors appears. However, initial dispersion decreases systematically as the number of distractors increases. The percentage of averaging saccades produced in the search task was not consistently dependent on the number of distractors. A significant fraction of averaging saccades still occurred for much wider spatial separations of stimuli than in previous studies using two visual stimuli with no specified target. The curvature of saccade trajectories increased dramatically when distractors were present, but the amount of curvature was not systematically affected by the number of distractors. Errors present in saccade trajectory in the search task were only poorly compensated. We conclude that these variable saccade trajectories result from incomplete or inaccurate specification of the target when competing stimuli are present and that a smaller number of more widely spread distractors facilitate saccade variability, perhaps due to the greater difficulty of target selection.

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  • Some oculomotor measures were affected by the number of choices.

    “Some of these measures were affected by the number of choices 48,49 (Supplementary Fig. 8).”

    From Decision-making with multiple alternatives (2008) · cites this paper as [48]

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Authors
Arai, K., McPeek, R. M., & Keller, E. L.
Affiliations
Smith-Kettlewell Eye Research Institute (US)
ORCID
McPeek, Robert M.
Venue
Journal of Neurophysiology
Publisher
American Physiological Society
Published
2004-02
Volume
91
Issue
2
Pages
890-900
ISSN
  • 0022-3077 (ISSN-L)
  • 1522-1598
DOI
10.1152/jn.00818.2003
OpenAlex
W2017577978
Cited by
62
References
42
Citations by year
2026: 2 · 2025: 1 · 2024: 1 · 2023: 2 · 2022: 1 · 2021: 2 · 2019: 2 · 2018: 2 · 2017: 3 · 2016: 1 · 2015: 5 · 2014: 4 · 2013: 3 · 2012: 4
FWCI
1.84
Type
journal article
Language
en
Open access
closed
Locations
  • Journal of Neurophysiology (publishedVersion)
  • PubMed (publishedVersion)
Funders
National Eye Institute (EY08060)
Topics
  • Life Sciences › Neuroscience › Cognitive Neuroscience › Visual perception and processing mechanisms
  • Life Sciences › Neuroscience › Cognitive Neuroscience › Motor Control and Adaptation
  • Physical Sciences › Computer Science › Computer Vision and Pattern Recognition › Visual Attention and Saliency Detection
Keywords
saccades, distractors, visual search, saccade latency, target selection, target specification
MeSH terms
Animals, Macaca mulatta, Male, Orientation, Photic Stimulation, Reaction Time, Saccades

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