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Molecular Autism
Published in: Molecular Autism 1/2014

Open Access 01-12-2014 | Research

Reduced beta connectivity during emotional face processing in adolescents with autism

Authors: Rachel C Leung, Annette X Ye, Simeon M Wong, Margot J Taylor, Sam M Doesburg

Published in: Molecular Autism | Issue 1/2014

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Abstract

Background

Autism spectrum disorder (ASD) is a neurodevelopmental disorder characterized by impairments in social cognition. The biological basis of deficits in social cognition in ASD, and their difficulty in processing emotional face information in particular, remains unclear. Atypical communication within and between brain regions has been reported in ASD. Interregional phase-locking is a neurophysiological mechanism mediating communication among brain areas and is understood to support cognitive functions. In the present study we investigated interregional magnetoencephalographic phase synchronization during the perception of emotional faces in adolescents with ASD.

Methods

A total of 22 adolescents with ASD (18 males, mean age =14.2 ± 1.15 years, 22 right-handed) with mild to no cognitive delay and 17 healthy controls (14 males, mean age =14.4 ± 0.33 years, 16 right-handed) performed an implicit emotional processing task requiring perception of happy, angry and neutral faces while we recorded neuromagnetic signals. The faces were presented rapidly (80 ms duration) to the left or right of a central fixation cross and participants responded to a scrambled pattern that was presented concurrently on the opposite side of the fixation point. Task-dependent interregional phase-locking was calculated among source-resolved brain regions.

Results

Task-dependent increases in interregional beta synchronization were observed. Beta-band interregional phase-locking in adolescents with ASD was reduced, relative to controls, during the perception of angry faces in a distributed network involving the right fusiform gyrus and insula. No significant group differences were found for happy or neutral faces, or other analyzed frequency ranges. Significant reductions in task-dependent beta connectivity strength, clustering and eigenvector centrality (all P <0.001) in the right insula were found in adolescents with ASD, relative to controls.

Conclusions

Reduced beta synchronization may reflect inadequate recruitment of task-relevant networks during emotional face processing in ASD. The right insula, specifically, was a hub of reduced functional connectivity and may play a prominent role in the inability to effectively extract emotional information from faces. These findings suggest that functional disconnection in brain networks mediating emotional processes may contribute to deficits in social cognition in this population.
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Metadata
Title
Reduced beta connectivity during emotional face processing in adolescents with autism
Authors
Rachel C Leung
Annette X Ye
Simeon M Wong
Margot J Taylor
Sam M Doesburg
Publication date
01-12-2014
Publisher
BioMed Central
Published in
Molecular Autism / Issue 1/2014
Electronic ISSN: 2040-2392
DOI
https://doi.org/10.1186/2040-2392-5-51

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