Face inversion effects in autism: a combined looking time and pupillometric study.
Upside-down faces make preschoolers with autism lock onto single features and work harder—keep visual supports upright.
01Research in Context
What this study did
Falck-Ytter (2008) watched preschoolers with and without autism while they looked at faces.
Some faces were right-side up, others were upside-down.
Eye-tracking cameras recorded where kids looked. A second camera measured pupil size.
What they found
Both groups looked less at upside-down faces.
Kids with autism locked their gaze on single features, like a mouth or an eye.
Their pupils also grew wider, showing extra brain work.
How this fits with other research
Hedley et al. (2015) tested adults with the same upside-down faces. They found equal struggle in both groups, so the extra load seen by Terje seems to fade with age.
Ma et al. (2021) pooled 140 eye-tracking papers and confirmed that reduced eye-looking is universal in autism. Terje’s feature-locked gaze is one early example in that big picture.
Lemons et al. (2015) used the same pupillometer with preschoolers but showed mutual gaze caused no extra arousal. Together the studies say: upside-down faces tax the brain, direct eye contact does not.
Why it matters
Expect face cards or emotion charts to be harder to read when they are upside-down or sideways.
Start with upright, clearly spaced photos.
If a child keeps staring at one part, prompt them to “do a eyes-nose-mouth trip” to build whole-face scanning.
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02At a glance
03Original abstract
Previous research has found that in typically developing individuals, behavioral performance declines and electrophysiological brain responses are altered when the face is inverted. Such effects are generally attributed to disruption of configural information. Individuals with autism spectrum disorder (ASD) have been found to show less pronounced inversion effects, a result in line with the view that featural processing of faces is enhanced in ASD. No study has determined if, or how, such local bias is reflected in the eye movements used in face observation. In this eye tracking study, looking time and pupil dilation were investigated during the presentation of upright and inverted faces in preschool children with ASD and typically developing preschoolers. On average, both children with ASD and typically developing children looked less at the face and the eye areas during inverted presentations than during upright presentations. Nevertheless, individuals with ASD had a stronger tendency than typically developing children to look at the same face features during upright and inverted presentations, which is suggestive of a local bias. Pupil dilation, reflecting increased processing load, was larger for inverted than upright faces in the ASD group only, and pupillary inversion effects were stronger in ASD than in typically developing children.
Autism research : official journal of the International Society for Autism Research, 2008 · doi:10.1002/aur.45