Functional neuroimaging and childhood autism

Area of Science:

• Neuroscience
• Developmental Psychology
• Medical Imaging

Background:

• Childhood autism is recognized as a neurodevelopmental disorder.
• Previous structural brain imaging studies in autism identified abnormalities like increased brain volume and cerebellar differences, but these do not fully explain autistic symptoms.
• Functional brain imaging techniques (PET, SPECT, fMRI) offer new insights into brain function in autism.

Purpose of the Study:

• To review the primary findings from functional brain imaging studies in autism.
• To present results from both resting-state and activation studies.

Main Methods:

• Review of functional brain imaging studies, including positron emission tomography (PET), single photon emission computed tomography (SPECT), and functional magnetic resonance imaging (fMRI).
• Analysis of studies conducted at rest and during activation tasks involving perceptive and cognitive paradigms.

Main Results:

• Early functional imaging studies lacked sensitivity to detect consistent brain dysfunction in autism.
• Recent advanced imaging revealed bilateral temporal lobe hypoperfusion in children with autism.
• Activation studies demonstrated abnormal cortical activation patterns, suggesting atypical connectivity between cortical regions.

Conclusions:

• Functional brain imaging provides crucial data on brain alterations in autism.
• Findings suggest altered functional connectivity between cortical regions in individuals with autism.
• Further research using advanced imaging techniques is essential to fully understand the neurobiological underpinnings of autism.