Neuroimaging of autism

Area of Science:

• Neuroimaging
• Autism Spectrum Disorder Research
• Neurobiology

Background:

• Magnetic resonance imaging (MRI) has been instrumental in understanding the neurobiological underpinnings of autism spectrum disorder (ASD).
• Previous research has identified structural variations in specific brain regions associated with ASD.

Purpose of the Study:

• To review the current understanding of brain abnormalities in autism using neuroimaging.
• To summarize findings from structural MRI studies and discuss insights from advanced MRI applications.

Main Methods:

• Review of structural magnetic resonance imaging (MRI) studies examining brain volumes (total brain, cerebellum, caudate nucleus, thalamus, amygdala, corpus callosum).
• Inclusion of findings from functional MRI (fMRI) and diffusion tensor imaging (DTI) over the past five years.
• Analysis of alterations in white matter pathways.

Main Results:

• Structural MRI studies indicate differences in the volume of several brain regions and the corpus callosum in individuals with autism.
• Functional MRI reveals dysfunctional activation in brain areas critical for communication, social interaction, and executive functions.
• Diffusion tensor imaging highlights white matter alterations in key brain communication pathways.

Conclusions:

• Neuroimaging, particularly advanced MRI techniques, provides significant insights into the neurobiological basis and pathophysiology of autism.
• Abnormalities in brain structure, function, and white matter integrity are characteristic of autism.