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Photoreceptors and Visual Pathways

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Related Experiment Video

Updated: May 13, 2025

Pupillometry to Assess Auditory Sensation in Guinea Pigs

Pupillometry to Assess Auditory Sensation in Guinea Pigs

Published on: January 6, 2023

Does pseudoneglect influence pupillary light or dark response?

Wiktor Więcławski¹, Aleksandra Smus Marek Binder¹, Marek Binder¹

¹Institute of Psychology, Jagiellonian University, Krakow, Poland.

Vision Research

|May 10, 2025

Summary

This summary is machine-generated.

This study investigated attentional bias using pupil responses but found no evidence of pseudoneglect. It highlighted contraction anisocoria, where pupil constriction is stronger for stimuli on the same side as the recording, suggesting this physiological effect needs consideration.

Keywords:

Contraction anisocoria Covert attention Pseudoneglect Pupillometry Spatial attention Unilateral neglect

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Area of Science:

Neuroscience
Cognitive Psychology
Ophthalmology

Background:

Pupillary light response (PLR) is influenced by spatial attention.
Pseudoneglect, an attentional bias, is sometimes indicated by larger pupil constrictions to left-sided stimuli.
The split-screen method is a novel approach to measuring spatial attentional bias.

Purpose of the Study:

To replicate the pseudoneglect effect using the split-screen method.
To investigate the role of visual competition in PLR modulation.
To explore pupillary dark response (PDR) for attentional modulation of pupil dilation.

Main Methods:

Utilized the split-screen method to present visual stimuli.
Recorded pupillary responses from both eyes to account for anisocoria.
Included conditions with and without competing visual stimuli.
Assessed both pupillary light response (PLR) and pupillary dark response (PDR).

Main Results:

No significant pseudoneglect effect was observed; pupil constriction was not consistently greater for left-sided stimuli.
Strong evidence of contraction anisocoria was found, where ipsilateral stimuli elicited greater constriction.
No significant attentional modulation of PDR or evidence of dilation anisocoria was detected.

Conclusions:

The split-screen method may detect physiological asymmetries like anisocoria.
The sensitivity of the split-screen method to attentional biases in neurotypical populations requires further research.
Contraction anisocoria is a significant factor to consider in pupillary response studies.