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Related Experiment Video

Updated: Jun 14, 2025

Development of a Gaze-Contingent Display Framework Designed for Perceptual and Oculomotor Research with Simulated Central Vision Loss

Development of a Gaze-Contingent Display Framework Designed for Perceptual and Oculomotor Research with Simulated Central Vision Loss

Published on: April 11, 2025

Simple actions modulate context-dependent visual size perception at late processing stages.

Haoyang Yu¹, Irene Sperandio², Lihong Chen¹

¹Research Center of Brain and Cognitive Neuroscience, Liaoning Normal University, Dalian 116029, China; Key Laboratory of Brain and Cognitive Neuroscience, Liaoning Province, Dalian 116029, China.

|September 3, 2024

Summary

This summary is machine-generated.

Performing an action, like a button press, improves visual perception and reduces the Ebbinghaus illusion. This action effect depends on the motor cortex, suggesting action guides perception.

Keywords:

Ebbinghaus illusion Interocular transfer Perceived size Simple action rTMS

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Area of Science:

Cognitive Neuroscience
Visual Perception
Motor Control

Background:

Action-specific effects on perception are known, but their generality and neural basis require further investigation.
The Ebbinghaus illusion provides a paradigm to study how action influences visual processing.
Understanding the role of the primary motor cortex (M1) is crucial for elucidating action-perception links.

Purpose of the Study:

To determine if the action effect generalizes to a size-matching task involving the Ebbinghaus illusion.
To investigate the neural mechanisms underlying the action effect using repetitive transcranial magnetic stimulation (rTMS).
To explore the role of the right primary motor cortex (M1) in mediating action-guided perception.

Main Methods:

Participants performed a size-matching task with the Ebbinghaus illusion stimuli.
The action effect was assessed by comparing a key-press condition to passive viewing.
Repetitive TMS was applied over the right primary motor cortex (M1) to disrupt its activity.
Stimuli were presented either binocularly or dichoptically to test visual processing stages.

Main Results:

A prior key-press significantly reduced the magnitude of the Ebbinghaus illusion compared to passive viewing.
The action effect persisted even when the illusion's components were presented dichoptically.
Disruption of the right primary motor cortex (M1) via rTMS abolished the action effect.
These findings indicate action influences late-stage visual processing.

Conclusions:

Action plays a significant role in guiding visual perception, extending beyond simple visual search tasks.
The action effect on the Ebbinghaus illusion appears to rely on feedback from the motor cortex, specifically M1.
These results highlight the intricate interplay between motor commands and visual processing in shaping human behavior.