Monochannel Preference in Autism Spectrum Conditions Revealed by a Non-Visual Variant of Rubber Hand Illusion.
Mattia Galigani, Carlotta Fossataro, Patrizia Gindri and 2 others
PMID 34595575WHAT IT FOUND
Children with autism showed reduced susceptibility to the classic rubber hand illusion.
However, when the illusion relied only on touch rather than sight and touch, their proprioceptive drift matched that of typically developing peers, suggesting a preference for monochannel sensory processing.
Key findings
01Typically developing children showed greater proprioceptive drift and higher subjective ownership ratings than children with autism spectrum conditions.
02Children with autism showed significant proprioceptive drift only in the tacto-tactile (touch-only) condition, not in the visuo-tactile (sight and touch) condition.
03Subjective ownership ratings in the autism group never reached positive agreement, even when the illusion was effective on proprioception.
STILL TO COME
How it was doneWhat they foundWhat it means for OTsWhat it means for SLPs
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What it does not show
The study used a between-subjects design, meaning different children performed the visuo-tactile and tacto-tactile tasks, which may introduce group differences unrelated to the illusion itself. Subjective ownership ratings in the autism group never reached positive agreement, raising questions about whether the questionnaire items were interpreted literally or if the subjective experience was genuinely absent despite proprioceptive changes. The sample was restricted to high-functioning individuals with normal or above-average IQ, so results may not generalize to those with lower cognitive abilities.
Declared interests
The study was funded by Compagnia di San Paolo, Fondazione Giovanni Goria, and Università degli Studi di Torino. No specific conflicts of interest were declared in the provided text.
The easy way to misread this
Do not assume that the lack of subjective ownership ratings in the autism group means the illusion failed entirely. The proprioceptive drift was significant in the touch-only condition, indicating that bodily perception changed even if the conscious feeling of ownership did not.