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Related Experiment Video

Updated: Jul 24, 2026

Assessing Binocular Central Visual Field and Binocular Eye Movements in a Dichoptic Viewing Condition

Assessing Binocular Central Visual Field and Binocular Eye Movements in a Dichoptic Viewing Condition

Published on: July 21, 2020

The area of spatial integration for initial horizontal disparity vergence

A V Popple¹, H S Smallman, J M Findlay

¹Department of Psychology, University of Durham, U.K. A.V.Popple@dur.ac.uk

Vision Research

|April 16, 1998

Summary

This study found that initial vergence responses integrate retinal disparity over a large central area, approximately 6 degrees in diameter. This spatial integration region helps in automatically processing cyclopean targets.

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Area of Science:

Vision science
Ophthalmology
Neuroscience

Background:

Vergence eye movements are crucial for binocular vision.
Understanding the spatial extent of disparity integration is key to comprehending early visual processing.

Purpose of the Study:

To determine the central area over which retinal disparity is integrated to elicit an initial vergence response.
To investigate the spatial extent of the automatic vergence response to cyclopean targets.

Main Methods:

Used random-dot stereograms with varying circular disc sizes and crossed retinal disparity.
Measured vergence responses subjectively using a forced-choice dichoptic nonius vernier task after brief (230 msec) stimulus presentation.
Ten observers participated in the study.

Main Results:

Initial vergence increased with increasing disc diameter.
Vergence reached a maximum for disc diameters around 6 degrees for most subjects.
Below 6 degrees, disparities of the surround and target were averaged.

Conclusions:

The spatial integration region for initial vergence response to central targets is approximately 6 degrees in diameter.
Initial horizontal vergence automatically pools disparities within this large area for cyclopean targets.