Brain function distinguishes female carriers and non-carriers of familial risk for autism.
Adam T Eggebrecht, Ally Dworetsky, Zoë Hawks and 8 others
PMID 33081838WHAT IT FOUND
Previously proposed brain markers did not separate women with family history of autism from matched controls.
Exploratory whole-brain tests found some differences in motion-processing regions, not the expected social motion signature.
Key findings
01The main test of 12 previously reported brain regions found no group differences between carrier females and non-carrier females.
02Exploratory whole-brain analysis found three regions where group differences depended on the type of motion; one showed stronger biological-motion responses in carriers, and another showed negative responses to both movie types.
03Brain responses did not correlate with cognitive ability or social responsiveness scores.
STILL TO COME
How it was doneWhat they found
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What it does not show
The study analysed only 21 carrier females and 25 non-carrier females, so small differences may be unstable. Of 29 carrier and 28 non-carrier women scanned, exclusions and matching left 21 and 25 for analysis. Carrier status was inferred from family history and pedigree patterns, not from genetic testing. There was no autism clinical group, so the results cannot say whether the observed brain differences are specific to autism risk or to autism itself. The main preselected brain regions were null, and the whole-brain findings were exploratory. Eye tracking could not be used, so gaze differences may have affected brain responses to the videos. The sample was adult females only, so it does not show what happens in children, males, or people with autism.
Declared interests
Listed as supported by NIH extramural and non-U.S. government research. No author conflict statement appears in the supplied text.
The easy way to misread this
Do not read the brain differences as evidence that autism can be detected in a patient or that a therapy should change. The expected marker test was null, the positive findings were exploratory whole-brain results in a small group of unaffected women, and no brain measure was linked to social responsiveness or cognition.