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Updated: Apr 21, 2026
Testing Sensory and Multisensory Function in Children with Autism Spectrum Disorder
Published on: April 22, 2015
Reduced beta band connectivity during number estimation in autism
Katrin A Bangel1, Magali Batty2, Annette X Ye3
1Department of Diagnostic Imaging, Hospital for Sick Children, Toronto, Canada ; Neurosciences & Mental Health, Hospital for Sick Children Research Institute, Toronto, Canada ; Department of Psychiatry, Academic Medical Center, University of Amsterdam, Amsterdam, The Netherlands.
Individuals with Autism Spectrum Disorder (ASD) show reduced long-range brain connectivity during a number estimation task. This suggests impaired communication between brain regions may underlie difficulties in processing integrated visual information.
Area of Science:
- Neuroscience
- Cognitive Science
- Developmental Psychology
Background:
- Disruptions in sensory and perceptual integration are implicated in Autism Spectrum Disorder (ASD).
- Altered brain connectivity and inter-regional communication patterns are observed in ASD, potentially contributing to cognitive challenges.
- Understanding neural communication during perceptual tasks is crucial for elucidating ASD-related atypicalities.
Purpose of the Study:
- To investigate inter-regional phase synchronization during a numerosity estimation task in individuals with ASD and typically developing controls.
- To identify alterations in brain connectivity associated with processing globally coherent versus random visual stimuli in ASD.
- To explore the role of neural communication deficits in integrative processing difficulties in ASD.
Main Methods:
- Magnetoencephalography (MEG) was employed for atlas-guided source space analysis of inter-regional phase synchronization.
- Participants (ASD and controls) performed a dot number estimation task with globally integrated (animal shapes) and random stimuli.
- Analysis focused on theta, alpha, and beta frequency bands during early task-dependent processing (70-145 ms).
Main Results:
- Task-dependent increases in inter-regional phase synchrony were observed across frequency bands.
- Participants with ASD exhibited reduced long-range beta-band phase synchronization during presentation of globally coherent dot patterns.
- This reduction in connectivity involved widespread brain regions, including occipital, parietal, temporal, and frontal areas.
Conclusions:
- This study provides the first evidence of altered inter-regional phase synchronization during numerosity estimation in ASD.
- Early reductions in long-range beta-band connectivity in ASD suggest impaired communication among brain regions during visual integration.
- These findings support the hypothesis that difficulties in inter-regional communication contribute to challenges in extracting meaningful 'Gestalt' features in ASD.
