State-Dependent Differences in Functional Connectivity in Young Children With Autism Spectrum Disorder

Area of Science:

• Neuroscience
• Developmental Neuroscience
• Autism Spectrum Disorder Research

Background:

• Growing evidence suggests altered brain connectivity in autism spectrum disorder (ASD).
• The specific patterns and uniqueness of these connectivity alterations in autism remain unclear.
• This study aimed to differentiate connectivity in children with autism from controls.

Purpose of the Study:

• To compare brain connectivity in children with autism to typically developing children and those with developmental delay.
• To identify unique connectivity markers associated with autism.
• To investigate state-dependent connectivity differences.

Main Methods:

• Electroencephalography (EEG) spectral power, coherence, phase lag, and correlations were assessed.
• Epileptiform activity was analyzed during awake, slow wave sleep, and REM sleep states.
• 137 children (ages 2-6) with autism, developmental delay, or typical development were included.

Main Results:

• Brain connectivity measures (coherence, phase lag, correlations) differentiated children with autism.
• Children with autism generally showed increased coherence, most notably during slow wave sleep.
• Connectivity differences were state- and region-specific.

Conclusions:

• Functional brain connectivity is distinctly altered in children with autism.
• Autism is characterized by a dynamic pattern of altered connectivity.
• Connectivity differences are specific to developmental status and sleep states.