Visual local and global processing in low-functioning deaf individuals with and without autism spectrum disorder.
Enhanced visual local processing shows up equally in low-functioning deaf and hearing people with ASD, so pull out picture-based tests when you suspect autism in deaf clients.
01Research in Context
What this study did
Carter et al. (2011) looked at how low-functioning deaf people see tiny visual details.
They tested four groups: deaf with autism, deaf without autism, hearing with autism, and hearing without autism.
Everyone tried to spot small patterns inside bigger pictures that had no meaning.
What they found
Both autism groups did better than the non-autism groups at finding the small bits.
Deaf or hearing did not matter; autism was the key.
The result says autism brings a strong eye for local detail, even when someone is deaf and has low IQ.
How this fits with other research
Guy et al. (2019) saw the same local bias in kids and teens with autism, so the skill stays steady as children grow.
Capio et al. (2013) pushed the idea further: people with autism can catch picture flashes only 17 ms apart, showing the detail skill works in time too.
Cardillo et al. (2020) seems to clash: they found no local edge in autism when IQ is typical. The gap is simple — W et al. studied people who also have intellectual disability, so the local boost may only show up when autism and ID occur together.
Why it matters
If you assess deaf clients who have low IQ, do not rely only on language tests. Use visual tools like ComFor that reward sharp local eyes. A strong score on detail tasks can support an autism diagnosis even when sign or speech is limited.
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02At a glance
03Original abstract
BACKGROUND: The ComFor study has indicated that individuals with intellectual disability (ID) and autism spectrum disorder (ASD) show enhanced visual local processing compared with individuals with ID only. Items of the ComFor with meaningless materials provided the best discrimination between the two samples. These results can be explained by the weak central coherence account. The main focus of the present study is to examine whether enhanced visual perception is also present in low-functioning deaf individuals with and without ASD compared with individuals with ID, and to evaluate the underlying cognitive style in deaf and hearing individuals with ASD. METHOD: Different sorting tasks (selected from the ComFor) were administered from four subsamples: (1) individuals with ID (n = 68); (2) individuals with ID and ASD (n = 72); (3) individuals with ID and deafness (n = 22); and (4) individuals with ID, ASD and deafness (n = 15). Differences in performance on sorting tasks with meaningful and meaningless materials between the four subgroups were analysed. Age and level of functioning were taken into account. RESULTS: Analyses of covariance revealed that results of deaf individuals with ID and ASD are in line with the results of hearing individuals with ID and ASD. Both groups showed enhanced visual perception, especially on meaningless sorting tasks, when compared with hearing individuals with ID, but not compared with deaf individuals with ID. CONCLUSIONS: In ASD either with or without deafness, enhanced visual perception for meaningless information can be understood within the framework of the central coherence theory, whereas in deafness, enhancement in visual perception might be due to a more generally enhanced visual perception as a result of auditory deprivation.
Journal of intellectual disability research : JIDR, 2011 · doi:10.1111/j.1365-2788.2010.01351.x