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Related Experiment Video

Updated: Dec 5, 2025

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

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

Published on: March 18, 2019

Perception of saccadic reaction time.

Valentina Vencato^1,2, Laurent Madelain^3,4

¹UMR 9193-SCALab, CNRS, Univ. Lille, 59000, Lille, France. valentina.vencato@uclouvain.be.

Scientific Reports

|October 15, 2020

Summary

This summary is machine-generated.

Participants can perceive their own saccadic reaction times (SRTs), distinguishing small differences. This ability supports the idea that the brain can solve the credit assignment problem even for rapid actions.

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Area of Science:

Cognitive Neuroscience
Oculomotor Research

Background:

Saccadic reaction times (SRTs) are influenced by reinforcement.
Accurate perception of one's own SRTs is crucial for credit assignment.

Purpose of the Study:

To quantify the human ability to perceive saccadic reaction times (SRTs).
To investigate the threshold for discriminating SRTs in a visual target saccade paradigm.

Main Methods:

An adaptive procedure trained 16 participants in a stepping visual target saccade task.
A 2-alternative forced-choice (2-AFC) task measured the SRT perceptual threshold at 75%.
Feedback was provided after each trial to signal correct choices.

Main Results:

The average SRT perceptual threshold was 23% (approximately 40 ms).
Participants could discriminate subtle differences in their reaction times.

Conclusions:

The ability to discriminate small SRT differences suggests the credit assignment problem can be solved for rapid actions.
This finding has implications for understanding reinforcement learning and motor control.