Autistic traits and individual brain differences: functional network efficiency reflects attentional and social impairments, structural nodal efficiencies index systemising and theory-of-mind skills.
Subhadip Paul, Aditi Arora, Rashi Midha and 3 others
PMID 33478557WHAT IT FOUND
In 30 adults, higher autistic traits and slower attention were linked to more efficient brain-wide functional networks, contradicting the expectation of poorer connectivity.
Systemising and perspective-taking skills were linked to specific structural brain regions.
Key findings
01Global functional clustering, path length and efficiency correlated with Social Responsiveness Scale scores and Attention Network Test orienting scores.
02Global structural clustering and efficiency correlated with Systemizing Quotient scores, driven by nodal metrics in medial temporal lobes and right temporal pole.
03Allocentric first-order theory-of-mind reaction time difference was associated with efficiency and clustering in the right supramarginal gyrus.
STILL TO COME
How it was doneWhat they found
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What it does not show
The sample size was small (30 participants), limiting the generalisability of the findings. The study was conducted in healthy adults with no history of psychological or neurological disorders, so results may not apply to individuals with diagnosed autism. The direction of the functional connectivity findings (greater efficiency with higher autistic traits) was contrary to the authors' hypotheses and previous literature, suggesting complex or non-monotonic relationships. Behavioural measures like the Systemizing Quotient and Reading the Mind in the Eyes Test have debated construct validity, particularly regarding whether they measure the intended cognitive traits or confounds like verbal ability. The study used cross-sectional data, so it cannot determine whether brain connectivity differences cause behavioural traits or vice versa.
Declared interests
The study was supported by the U.S. Government (Non-P.H.S.), specifically the Directorate for Social, Behavioral and Economic Sciences.
The easy way to misread this
Do not interpret the finding of 'greater functional network efficiency' in individuals with higher autistic traits as evidence that autism is associated with superior brain connectivity. The study found this association in healthy adults and noted it contradicted their hypothesis; the clinical meaning of this 'efficiency' in relation to actual functional impairment is unclear and likely reflects a complex, non-linear relationship rather than a simple deficit or advantage.