Quantitative analysis of the shape of the corpus callosum in patients with autism and comparison individuals.
High-functioning autism shows a smaller corpus callosum, hinting at broad wiring gaps that may slow social cue transfer.
01Research in Context
What this study did
The team scanned the brains of adults with high-functioning autism.
They used MRI to map the exact shape of the corpus callosum.
Each scan was compared to a matched control without autism.
What they found
The entire corpus callosum was smaller in the autism group.
The shrinkage showed up in every region they measured.
This points to wide, not spotty, wiring differences.
How this fits with other research
McGonigle et al. (2014) saw normal resting pupil size in autism.
That study found no baseline body arousal difference.
The two papers seem to clash, but they measure different systems.
One looks at brain structure; the other at eye physiology.
Balardin et al. (2015) also used surface brain mapping.
They linked cortical thickness to IQ in the same population.
Together the studies show both gray and white matter vary in autism.
Why it matters
You can’t see the corpus callosum on the outside, yet its size may shape how fast hemispheres share social cues.
When you plan social-skills training, remember the neural highway might be smaller, so allow extra time for cross-brain integration.
Pair your lessons with activities that slowly build inter-hemispheric transfer, such as cross-body motor games.
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02At a glance
03Original abstract
Multiple studies suggest that the corpus callosum in patients with autism is reduced in size. This study attempts to elucidate the nature of this morphometric abnormality by analyzing the shape of this structure in 17 high-functioning patients with autism and an equal number of comparison participants matched for age, sex, IQ, and handedness. The corpus callosum was segmented from T1 weighted images acquired with a Siemens 1.5 T scanner. Transformed coordinates of the curvilinear axis were aggregated into a parametric map and compared across series to derive regions of statistical significance. Our results indicate that a reduction in size of the corpus callosum occurs over all of its subdivisions (genu, body, splenium) in patients with autism. Since the commissural fibers that traverse the different anatomical compartments of the corpus callosum originate in disparate brain regions our results suggest the presence of widely distributed cortical abnormalities in people with autism.
Autism : the international journal of research and practice, 2011 · doi:10.1177/1362361310386506