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Related Experiment Videos

Vergence target selection in rhesus monkeys: behavior and modeling.

James R Dearworth1, Ryan C Davison, Xinru Li

  • 1Vision Science Research Center, University of Alabama at Birmingham, Birmingham, AL 35294, USA. dearworj@lafayette.edu

Vision Research
|January 11, 2005
PubMed
Summary

The Linear Approach to Threshold with Ergodic Rate (LATER) model explains how rhesus monkeys choose visual targets for vergence eye movements. This competition between internal processes influences movement selection and timing.

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Area of Science:

  • Neuroscience
  • Computational Neuroscience
  • Ophthalmology

Background:

  • Previous research established the Linear Approach to Threshold with Ergodic Rate (LATER) model for saccadic eye movements.
  • The LATER model effectively explains target selection and response latencies in saccadic movements.

Purpose of the Study:

  • To investigate the applicability of the LATER model to decision-making in vergence eye movements.
  • To explore how luminance contrast influences target selection for transient vergence in rhesus monkeys.

Main Methods:

  • A forced-choice paradigm using Gabor pair stimuli with manipulated luminance contrast.
  • Analysis of response distributions and latencies using cumulative recinormal and reciprobit plots.
  • Monte Carlo simulations to estimate internal decision-making process rates.

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Main Results:

  • Monkeys initially favored divergent targets at low luminance contrast.
  • Increasing near-target luminance contrast shifted selection towards convergent targets.
  • Changes in target selection bias correlated with altered convergent and divergent latencies.

Conclusions:

  • The LATER race model successfully predicts observed vergence responses and latencies.
  • Competition between internal convergent and divergent processes underlies vergence target selection.
  • This competitive process dictates both the frequency and timing of vergence movements.