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Related Experiment Video

Updated: Jan 8, 2026

Corticospinal Excitability Modulation During Action Observation

Corticospinal Excitability Modulation During Action Observation

Published on: December 31, 2013

Presaccadic modulation of lateral interactions.

Gabriela Mueller de Melo^1,2,3,4, Isabella de Oliveira Pitorri^1,5, Gustavo Rohenkohl^1,6,2,7,8

¹Active Vision Lab, Institute of Biosciences, University of São Paulo, São Paulo, Brazil.

Journal of Vision

|December 12, 2025

Summary

This summary is machine-generated.

Saccade preparation enhances lateral inhibition in early vision, increasing target suppression at intermediate distances. This modulation helps prioritize salient visual information by suppressing homogeneous peripheral signals before eye movements.

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Published on: March 18, 2019

Area of Science:

Neuroscience
Visual Perception
Psychophysics

Background:

Lateral interactions are fundamental to early visual processing, influencing object perception.
Saccade preparation is known to impact visual perception, but its effect on lateral interactions is unclear.

Purpose of the Study:

To investigate whether saccade preparation modulates lateral interactions in the visual system.
To determine how flanker orientation and distance affect target detection during saccade preparation versus fixation.

Main Methods:

A psychophysical task involving Gabor targets and flanking gratings of varying orientation and distance.
Contrast thresholds for target detection were measured during saccade preparation and central fixation using a staircase procedure.

Main Results:

Target suppression was observed at short flanker distances (4λ), particularly with iso-oriented flankers.
Lateral interaction effects diminished with increasing flanker separation, disappearing at 16λ.
Presaccadic saccade preparation increased target suppression at an intermediate distance (8λ) compared to fixation.

Conclusions:

Saccade preparation modulates lateral interactions, enhancing suppressive effects at larger distances.
This presaccadic expansion of inhibition may aid target selection by suppressing irrelevant peripheral stimuli.
Findings align with visual remapping theories, suggesting coordinated activity in visual and oculomotor areas before saccades.