Autism spectrum disorders: developmental disconnection syndromes

Area of Science:

• Neurodevelopmental disorders
• Childhood psychology
• Brain anatomy and function

Background:

• Autism spectrum disorder (ASD) is a prevalent, heterogeneous neurodevelopmental disorder in children.
• ASD presents with diverse etiologies, behaviors, and cognitive profiles, challenging a single diagnostic entity.
• Existing research views ASD as a spectrum of conditions, often termed 'the autisms'.

Purpose of the Study:

• To propose a unifying developmental model for autism spectrum disorder.
• To explain the heterogeneity of autism etiology and clinical presentation.
• To integrate genetic and neuroimaging findings into a cohesive framework.

Main Methods:

• Review of recent genetic findings in autism.
• Analysis of emerging anatomical and functional brain imaging studies.
• Synthesis of evidence to support a developmental disconnection hypothesis.

Main Results:

• Genetic and neuroimaging data suggest partial developmental disconnection between higher-order association areas and the frontal lobe.
• This developmental disconnection model accommodates the emergence of neurobehavioral features during development.
• The model accounts for the heterogeneity observed in autism's causes, behaviors, and cognition.

Conclusions:

• A unifying model of developmental disconnection offers a framework for understanding autism spectrum disorder.
• This concept helps explain the diverse clinical manifestations and underlying etiologies of autism.
• Further research integrating genetic and neuroimaging data can refine this developmental model.