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Scanning Dos and Don'ts: Using Magnetic Resonance Imaging in Awake Children Aged 3 to 5 Years to Assess Brain Structure and Function

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Reduced interhemispheric coherence in dyslexic adults.

Monica Dhar¹, Pieter H Been, Ruud B Minderaa

¹BCN Neuroimaging Center, University Medical Center Groningen, University of Groningen, The Netherlands. Monica.Dhar@UGent.be

Cortex; a Journal Devoted to the Study of the Nervous System and Behavior

|October 14, 2009

Summary

Adult males with dyslexia show reduced interhemispheric brain connectivity, particularly in alpha activity within the central-parietal cortex. This suggests altered neural development impacting magnocellular processing.

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Assessing Dyslexia at Six Year of Age

Assessing Dyslexia at Six Year of Age

Published on: May 1, 2020

Area of Science:

Neuroscience
Cognitive Neuroscience
Developmental Neuroscience

Background:

Developmental dyslexia is linked to diminished interhemispheric neural connectivity in children.
Previous research suggests potential connectivity differences in dyslexic individuals.

Purpose of the Study:

To investigate functional interhemispheric connectivity in adult males with dyslexia.
To compare brain connectivity patterns between dyslexic adults and neurotypical controls.

Main Methods:

Functional interhemispheric coherence was assessed during a visuo-spatial attention task.
Electroencephalography (EEG) data from dyslexic men (n=19) and controls (n=15) were analyzed.
Coherence was measured between central-parietal electrodes in the left and right hemispheres.

Main Results:

Dyslexic adults exhibited reduced and more diffuse interhemispheric alpha activity coherence in the central-parietal cortex compared to controls.
No significant differences in interhemispheric coherence were observed at frontal, temporal, or central electrode sites between the groups.

Conclusions:

The findings indicate an atypical pattern of functional connectivity in adult dyslexics.
This deviant connectivity may stem from altered neural circuitry development.
The observed differences could contribute to deficits in magnocellular processing associated with dyslexia.