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Related Experiment Video

Updated: Jul 19, 2026

Assessing Dyslexia at Six Year of Age

Assessing Dyslexia at Six Year of Age

Published on: May 1, 2020

Auditory event-related potentials differ in dyslexics even when auditory psychophysical performance is normal.

Catherine J Stoodley¹, Penelope R Hill, John F Stein

¹Department of Physiology, Anatomy and Genetics, Oxford University, OX1 3PT, UK. cjs@physiol.ox.ac.uk

|October 3, 2006

Summary

Even dyslexic adults with normal auditory task performance may exhibit abnormal auditory processing. This study found smaller mismatch negativity (MMN) responses in dyslexic individuals at a specific frequency, suggesting underlying neural differences.

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Area of Science:

Neuroscience
Developmental Psychology
Auditory Neuroscience

Background:

Developmental dyslexia is often linked to phonological deficits, but the role of low-level auditory processing is debated.
Some dyslexic individuals perform adequately on behavioral auditory tasks, masking potential underlying processing impairments.
Coping strategies may influence behavioral performance, making electrophysiological measures crucial for detecting subtle auditory deficits.

Purpose of the Study:

To investigate electrophysiological evidence of impaired auditory processing in dyslexic adults who compensate for deficits on behavioral tasks.
To compare auditory event-related mismatch negativity (MMN) potentials in dyslexic and control groups using frequency-modulated (FM) tones at different rates.

Main Methods:

Auditory Mismatch Negativity (MMN) potentials were recorded in response to 5, 20, and 240 Hz FM tones.
Participants included dyslexic adults and age/cognitively matched controls with similar FM detection thresholds.
Statistical analysis involved a 2-way ANOVA to compare MMN responses between groups across different FM rates.

Main Results:

Dyslexic adults showed significantly smaller MMNs in the 20 Hz FM condition during both early (150-300 ms) and late (300-500 ms) time frames.
A significant group by FM rate interaction was observed, indicating differential MMN responses based on stimulus rate.
No significant group differences were found for 5 Hz or 240 Hz FM tones.

Conclusions:

Electrophysiological evidence suggests impaired auditory processing in some dyslexic adults, even when behavioral performance is adequate.
The 20 Hz FM MMN abnormality specifically highlights a potential deficit in processing certain auditory temporal patterns.
MMN magnitude correlated with cognitive-literacy discrepancies, reinforcing the link between auditory processing and dyslexia severity.