Diffusion tensor imaging in autism spectrum disorder: a review.
DTI scans keep showing the same white-matter weak spots in autism, but those changes are not unique to autism.
01Research in Context
What this study did
Duerden et al. (2012) read 48 brain-scan papers that used DTI. DTI is a scan that shows the cables that link brain areas.
All papers were about people with autism. The team wrote a plain-story review to see which cables differ most often.
What they found
The biggest cable changes live in three places. These are the corpus callosum, the cingulum, and the temporal lobe.
These tracks carry social, talk, and sound signals. The review says these spots give the steadiest DTI signal for autism.
How this fits with other research
Seiverling et al. (2012) looked at the same 48 DTI papers plus many fMRI ones. Their wider scan still found weak proof for DSM-5 rules. Together, the two 2012 papers say brain cables are odd in autism, yet not odd enough to diagnose alone.
Cauda et al. (2017) ran a bigger meta-analysis five years later. They mixed autism, schizophrenia, and OCD scans. They saw shared cable changes, not unique ones. This widens Duerden et al. (2012): the same cable hits may cross diagnoses.
Osipowicz et al. (2015) counted gray-matter volume across the lifespan. Less gray sat near the very white-matter tracks G et al. flagged. The two studies line up: in autism, both the wires and the wire hubs can shrink.
Why it matters
You cannot scan a child and get an autism score today. Still, knowing the cable roads most often hurt gives you solid clues. When a learner struggles with joint attention or rapid cues, check if tasks cross the corpus callosum or temporal lobe. Break the task, slow the pace, or add visual aids. These tracks are shaky in autism, so give the brain less traffic at once.
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02At a glance
03Original abstract
White matter tracts of the brain allow neurons and neuronal networks to communicate and function with high efficiency. The aim of this review is to briefly introduce diffusion tensor imaging methods that examine white matter tracts and then to give an overview of the studies that have investigated white matter integrity in the brains of individuals with autism spectrum disorder (ASD). From the 48 studies we reviewed, persons with ASD tended to have decreased fractional anisotropy and increased mean diffusivity in white matter tracts spanning many regions of the brain but most consistently in regions such as the corpus callosum, cingulum, and aspects of the temporal lobe. This decrease in fractional anisotropy was often accompanied by increased radial diffusivity. Additionally, the review suggests possible atypical lateralization in some white matter tracts of the brain and a possible atypical developmental trajectory of white matter microstructure in persons with ASD. Clinical implications and future research directions are discussed.
Autism research : official journal of the International Society for Autism Research, 2012 · doi:10.1109/TMI.2007.906784