Increased left parietal volumes relate to delayed language development in autism: a structural mri study

Area of Science:

• Neuroscience
• Developmental Psychology
• Pediatrics

Background:

• The neural underpinnings of language and motor impairments in autism spectrum disorder (ASD) remain incompletely understood.
• The parietal lobe is recognized for its role in language processing and imitation, suggesting its potential involvement in ASD-related developmental delays.

Purpose of the Study:

• To investigate the association between the parietal lobe's structure and language and motor development in children with autism.
• To explore the specific role of left parietal gray matter volume in developmental trajectories within this population.

Main Methods:

• Structural magnetic resonance imaging (MRI) was used to assess brain structure in 28 children diagnosed with autism.
• Clinical assessments were conducted to evaluate language milestones (age at first word) and motor development (sitting, walking unaided).

Main Results:

• A significant positive correlation was observed between the volume of left parietal gray matter and earlier age at first word (r=0.50, p=0.007).
• No significant association was found between parietal lobe size and the age of achieving motor development milestones, even after controlling for age and gender.

Conclusions:

• This study provides novel structural MRI evidence implicating left parietal gray matter volume in delayed language development in autistic children.
• The findings suggest a specific neural correlate for language delays in a representative 'real-world' autistic population, distinct from motor development associations.