Resting-State Functional Connectivity in Autism Spectrum Disorders: A Review

Area of Science:

• Neuroscience
• Developmental Neuroscience

Background:

• Autism spectrum disorder (ASD) research using resting-state functional MRI (fMRI) presents conflicting findings regarding intrinsic brain connectivity.
• Studies report patterns of over-connectivity, under-connectivity, or mixed connectivity in autistic brains, complicating diagnostic classification.
• Heterogeneity within ASD, participant demographics (age, sex), scan design, and analytical methods contribute to these discrepancies.

Approach:

• Systematic review of existing resting-state fMRI studies on autism.
• Comparative analysis of methodologies and findings across studies.
• Identification of factors contributing to variability in reported connectivity patterns.

Key Points:

• Inconsistent findings in resting-state fMRI studies of autism connectivity.
• Significant variability in intrinsic connectivity patterns among individuals with ASD.
• Methodological differences (age, sex, scan design, analysis) impact study outcomes.

Conclusions:

• Current resting-state fMRI data present a complex and challenging picture of brain connectivity in autism.
• Future research directions are proposed to enhance the utility of rs-fMRI for categorizing individuals with ASD.
• Potential for rs-fMRI as a diagnostic tool and the importance of data-sharing initiatives are highlighted.