Language Delay in ASD Linked to Brain Symmetry
By Chelsea E. Toledo, M.A. on March 29, 2016
Background: Autism spectrum disorder (ASD) encompasses a broad array of conditions characterized by differences in socialization, communication, and behavior. One area where people with ASD can differ widely from one another is in language acquisition. Some individuals face severe delays in speech while others progress more typically.
What’s New: The January 2016 issue of Human Brain Mapping featured a study that explored the symmetry between brain hemispheres in individuals with or without language delay – defined as uttering one’s first words after 24 months of age or first phrases after 33 months of age. The researchers performed structural magnetic resonance imaging (MRI) on 136 right-handed men between the ages of 18 and 43 (67 with ASD and 69 with typical development). Participants in the ASD group had reduced asymmetry between several brain areas across the left and right sides of the brain, which was most pronounced in those with language delay and/or abnormal social functioning.
Why it’s important: This structural asymmetry of the brain could eventually help clinicians diagnose and understand specific subgroups of ASD. Future research could examine the brain symmetry of women and/or left-handed individuals with ASD.
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