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Related Experiment Video

Updated: May 15, 2026

Stimulus-specific Cortical Visual Evoked Potential Morphological Patterns

Stimulus-specific Cortical Visual Evoked Potential Morphological Patterns

Published on: May 12, 2019

Auditory modulation of visual stimulus encoding in human retinotopic cortex.

Benjamin de Haas¹, D Samuel Schwarzkopf, Maren Urner

¹UCL Institute of Cognitive Neuroscience, 17 Queen Square, London WC1N 3BG, UK. benjamin.haas.09@ucl.ac.uk

|January 9, 2013

Summary

This summary is machine-generated.

Incongruent sounds disrupt visual information processing in the human brain's early visual cortex (retinotopic cortex). This audio-visual interaction impairs stimulus decoding by increasing neural noise, not by altering signal amplitude.

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Area of Science:

Neuroscience
Cognitive Science
Auditory-Visual Interaction

Background:

Auditory stimuli influence visual perception and neural activity in the visual cortex.
Previous research focused on amplitude and phase reset, but recent studies show congruence affects information in neural spiking activity.

Purpose of the Study:

To investigate how the presence and congruence of sounds affect the discriminability of naturalistic visual stimuli in human retinotopic cortex.
To determine if audio-visual congruence modulates spatial patterns of functional MRI signals.

Main Methods:

Used naturalistic video stimuli and functional MRI (fMRI) to record spatial patterns in human retinotopic cortex.
Analyzed the discriminability of visual stimulus patterns with and without co-occurring sounds of varying congruence.

Main Results:

Incongruent sounds significantly impaired stimulus decoding in visual area V2, with a similar trend in V3.
This impairment was linked to reduced inter-trial reliability (increased noise) of neural patterns.
No significant modulation of overall signal amplitude was detected.

Conclusions:

Sounds modulate the encoding of naturalistic stimuli in early human retinotopic cortex without altering overall signal amplitude.
Mechanisms like subthreshold modulation, oscillatory phase reset, and dynamic attentional modulation may mediate these effects.