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Related Experiment Videos

Saccadic choice with asynchronous targets: evidence for independent randomisation.

J C Leach1, R H Carpenter

  • 1The Physiological Laboratory, University of Cambridge, CB2 3EG, Cambridge, UK.

Vision Research
|November 24, 2001
PubMed
Summary

Randomness in saccadic latency arises from independent signal variations at different locations. This study confirms that target choice probabilities can be predicted from individual target latency distributions, validating the LATER model.

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Area of Science:

  • Cognitive Neuroscience
  • Oculomotor Research
  • Computational Neuroscience

Background:

  • The LATER (Linear Approach to Threshold with Ergodicসংস্কার) model explains saccadic latency variability through random fluctuations in decision signal rise rates.
  • A key assumption is whether these fluctuations are independent across different spatial locations.

Purpose of the Study:

  • To investigate if random variations in the decision signal's rise rate are independent at different locations.
  • To test if saccade target choice probabilities in asynchronous target presentation can be predicted from individual target latency distributions.

Main Methods:

  • Human subjects were presented with pairs of targets asynchronously.
  • Saccadic latency distributions for individual targets were measured.

Related Experiment Videos

  • Target choice probabilities were analyzed in relation to presentation asynchrony.

    • Main Results:

    • The study successfully predicted target choice probabilities based on individual target latency distributions.
    • Findings support the hypothesis of independent random variations in saccadic latency at different locations.

    Conclusions:

    • Independent random variations in decision signal rise rates at different locations are supported.
    • This independence explains the randomness observed in saccade target selection in real-world scenarios.