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Association Areas of the Cortex01:21

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Related Experiment Video

Updated: May 9, 2026

Investigating the Deployment of Visual Attention Before Accurate and Averaging Saccades via Eye Tracking and Assessment of Visual Sensitivity
06:46

Investigating the Deployment of Visual Attention Before Accurate and Averaging Saccades via Eye Tracking and Assessment of Visual Sensitivity

Published on: March 18, 2019

Saccade target selection relies on feedback competitive signal integration.

Joke P Kalisvaart1, André J Noest, Albert V van den Berg

  • 1Section Biophysics, Department of Cognitive Neuroscience, Doders Institute for Brain, Cognition and Behaviour, Radboud University Nijmegen Medical Centre, 6500 HB Nijmegen, The Netherlands.

The Journal of Neuroscience : the Official Journal of the Society for Neuroscience
|July 19, 2013
PubMed
Summary

Human decision-making shows a bias towards initial information, even when later evidence contradicts it. This "primacy effect" suggests neural competition involves feedback inhibition, not just a race to a threshold.

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Area of Science:

  • Neuroscience
  • Cognitive Science
  • Decision Making

Background:

  • Decision-making models often assume evidence accumulation to a threshold.
  • The precise neural mechanisms of competition and commitment remain experimentally elusive.
  • Previous models lack experimental validation regarding feedback inhibition versus feedforward competition.

Purpose of the Study:

  • To investigate the neural competition dynamics during decision-making.
  • To differentiate between feedforward and feedback inhibition models of choice.
  • To examine the role of stimulus intensity and timing in target selection.

Main Methods:

  • Presenting subjects with two simultaneously flashed targets of dynamically reversing intensity.
  • Instructing participants to saccade towards the brightest target.
  • Analyzing choice probabilities and reaction times under varying stimulus conditions.

Main Results:

  • A significant "primacy effect" was observed, where subjects favored the initially brighter target.
  • This effect persisted even when the later, reversed-intensity phase was longer, indicating it wasn't due to premature commitment.
  • A non-monotonic relationship between target imbalance and primacy, indicative of hysteresis, supported feedback inhibition models.
  • Reaction times were independent of choice probability, suggesting distinct processes for target selection and movement initiation.

Conclusions:

  • Decision-making exhibits hysteresis, supporting models with strong feedback inhibition in neural competition.
  • Target selection and movement initiation appear to be dissociable processes.
  • The findings challenge simple first-to-threshold decision models and highlight the role of feedback mechanisms.