Visual processing in genetic conditions linked to autism: A behavioral study of binocular rivalry in individuals with 16p11.2 deletions and age-matched controls.
Binocular rivalry slows markedly in 16p11.2 deletion carriers—consider visual processing assessments when working with this genetic subgroup.
01Research in Context
What this study did
Choi et al. (2023) watched how fast teenagers and adults switched between two rival pictures shown to each eye.
They compared people with a 16p11.2 deletion to same-age peers without the deletion.
The task needed no talking or buttons—just report what you see as the pictures fight for attention.
What they found
The 16p11.2 group switched views much more slowly.
Slow rivalry means the brain’s balance of excite-to-inhibit signals is off, even though vision looks normal.
How this fits with other research
Karaminis et al. (2017) saw no rivalry slowing in autistic children, only shorter mixed views.
Bi’s new data say the marker shows up later and only in the 16p11.2 subtype, not in idiopathic autism—an apparent contradiction that points to gene-specific brain changes.
Heald et al. (2020) already showed 16p11.2 carriers vary widely in symptoms; adding a quick rivalry test gives you a cheap, non-verbal way to spot atypical visual wiring in this same group.
Why it matters
If you serve clients with known 16p11.2 deletions, slide a two-minute rivalry demo into your intake. Slow switches flag altered cortical balance and may explain why some teaching materials look confusing to them. Pair visuals with shorter exposure times or reduce competing patterns on the page.
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02At a glance
03Original abstract
Close phenotypic characterization of individuals with genetic conditions linked to autism provides a promising approach to navigating the heterogeneity of autism spectrum conditions. The current study investigated sensory processing in individuals with a rare genetic event that is highly penetrant for autism, 16p11.2 deletions, using a well-characterized visual paradigm, binocular rivalry, which is thought to be a non-invasive index of excitatory/inhibitory balance in the visual cortex. We characterized rivalry dynamics in 45 adolescent and adult individuals (19 individuals with 16p11.2 deletions, 26 age-matched neurotypical controls). We found that binocular rivalry perceptual transition rates were significantly slower for individuals with 16p11.2 deletions, relative to controls. Importantly, these results could not be accounted for by differences in motor response latencies or perceptual decision criteria, which were matched between groups. Results should be interpreted with caution given the unmatched psychometric features between groups, such as IQ. Future studies should study visual processing in other genetic groups linked to autism beyond 16p to understand the specificity of these findings. These results highlight the importance of characterizing sensory functions in individuals with genetic alterations associated with autism.
Autism research : official journal of the International Society for Autism Research, 2023 · doi:10.1002/aur.2901