Holistic processing of faces as measured by the Thatcher illusion is intact in autism spectrum disorders.
Autistic teens process whole faces like their peers, so teen social-skills programs can use normal face stimuli without special part-by-part training.
01Research in Context
What this study did
Sparaci et al. (2015) showed teens with autism the Thatcher illusion. This illusion flips eyes and mouths upside-down on upright faces. People usually spot the weird face faster when the whole face is upside-down.
The team tested both autistic and typically developing teens. They measured how fast and how accurately each group spotted the distorted faces.
What they found
Autistic teens showed the same illusion effect as their peers. They made the same error pattern and needed the same flip to notice the odd face.
In short, their brains still grouped the face as one whole picture, not just loose parts.
How this fits with other research
Wallace et al. (2008) and Hartston et al. (2023) saw the opposite in adults. They found weaker inversion effects in autistic adults, hinting at weaker holistic processing. Age is the key difference: teens looked typical, adults did not.
Cook et al. (2014) extends the story. They showed intact face adaptation in autistic adults, matching the teen null result. Together the studies paint a developmental curve: early quirks may smooth out by adolescence, then re-emerge in adulthood.
Alonso Soriano et al. (2015) used a different visual task on the same age group and also found no autism-specific bias. The pattern holds across tests: in mid-teen years, basic visual grouping looks typical.
Why it matters
If you teach social skills to autistic teens, assume their eyes are taking in faces the usual way. You can use whole-face photos, video modeling, and natural expressions without extra breakdown steps. Keep an eye on adult clients, though; the same holistic boost may not be there.
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02At a glance
03Original abstract
Impaired face perception in autism spectrum disorders is thought to reflect a perceptual style characterized by componential rather than configural processing of faces. This study investigated face processing in adolescents with autism spectrum disorders using the Thatcher illusion, a perceptual phenomenon exhibiting 'inversion effects' that characterize typical face processing. While previous studies used a limited range of face orientations, we measured perception of normality/grotesqueness of faces at seven orientations ranging from upright to inverted to allow for a detailed comparison of both reaction time and error by orientation profiles. We found that, like their typically developing peers, adolescents with autism spectrum disorders show strong inversion effects whereby reaction times were longer and error rates greater at inverted when compared to upright orientations. Additionally, the adolescents with autism spectrum disorders, like their peers in the typically developing group, show a marked nonlinearity in the error by orientation profile. Error is roughly constant out to 90° and then increases steeply, indicating a sudden shift from configural to local processing that reflects experience with faces in their typical orientations. These findings agree with recent reports that face perception is qualitatively similar in autistic and neurotypical groups.
Autism : the international journal of research and practice, 2015 · doi:10.1177/1362361314526005