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Changes in perceived egocentric direction during symmetric vergence.

Deepika Sridhar¹, Harold E Bedell

¹College of Optometry, University of Houston, 505 J Armistead Building, Houston, TX 77204, USA. dsridhar.2010@alumni.opt.uh.edu

|May 25, 2013

Summary

The Wells-Hering

Area of Science:

Visual neuroscience
Oculomotor research
Perception science

Background:

The Wells-Hering's laws of perceived egocentric visual direction (EVD) posit equal contributions from both eyes to eye position information.
This implies only versional eye movements alter perceived EVD.
Prior research indicated differential eye-position weighting during asymmetric vergence.

Purpose of the Study:

To investigate if differential eye-position information weighting occurs during symmetric vergence.
To challenge the Wells-Hering's laws' assumptions regarding symmetric vergence.

Main Methods:

Five subjects performed open-loop pointing tasks.
Evaluated perceived EVD under symmetric vergence demands (6-18 prism diopters base out).

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Quantified the contribution of each eye's position data to perceived EVD.

Main Results:

All subjects exhibited pointing responses consistent with unequal weighting of eye-position information.
The observed changes in perceived EVD contradicted the Wells-Hering's laws' predictions.
Symmetric vergence movements demonstrably altered perceived visual direction.

Conclusions:

Symmetric vergence eye movements can modify perceived visual direction.
Findings challenge the assumption of equal eye-position information contribution in the Wells-Hering's laws.
Suggests a more complex interplay of binocular information in EVD perception.