Children with autism spectrum disorder show altered functional connectivity and abnormal maturation trajectories in response to inverted faces.
Upside-down faces reveal weak long-distance brain links in autism, and the weaker the link, the stronger the symptoms.
01Research in Context
What this study did
The team used brain-wave helmets to watch kids look at upside-down faces.
They compared children with autism to same-age peers without autism.
The scan tracked how well different brain areas talked to each other.
What they found
Kids with autism showed weaker long-distance brain chat while viewing the odd faces.
The weaker the chat, the stronger the autism traits.
Typical kids grew stronger links with age; autistic kids did not.
How this fits with other research
Deruelle et al. (2004) already showed autistic kids focus on tiny face parts instead of the whole. The new study adds brain proof: long-range wires that bind parts into wholes stay quiet.
Li et al. (2025) also found weak social-visual pathway links at rest. Fahimeh et al. now show the same gap appears only when faces are upside-down, pointing to a task-specific break, not a constant one.
Dudley et al. (2019) tracked kids for two years and saw no growth in brain efficiency. The 2021 data match that stalled curve, but for face-connectivity, giving a clearer picture of what “immature” looks like.
Why it matters
When you flip a photo to teach emotion or do a matching game, watch the child’s effort. If they struggle more than with right-side faces, pause and teach them to scan the whole face step-by-step. Use arrows, color cues, or verbal prompts to build the global picture their long-range wires skip. Track progress: less struggle over weeks may mean those wires are finally waking up.
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02At a glance
03Original abstract
The processing of information conveyed by faces is a critical component of social communication. While the neurophysiology of processing upright faces has been studied extensively in autism spectrum disorder (ASD), less is known about the neurophysiological abnormalities associated with processing inverted faces in ASD. We used magnetoencephalography (MEG) to study both long-range and local functional connectivity, with the latter assessed using local cross-frequency coupling, in response to inverted faces stimuli, in 7-18 years old individuals with ASD and age and IQ matched typically developing (TD) individuals. We found abnormally reduced coupling between the phase of the alpha rhythm and the amplitude of the gamma rhythm in the fusiform face area (FFA) in response to inverted faces, as well as reduced long-range functional connectivity between the FFA and the inferior frontal gyrus (IFG) in response to inverted faces in the ASD group. These group differences were absent in response to upright faces. The magnitude of functional connectivity between the FFA and the IFG was significantly correlated with the severity of ASD, and FFA-IFG long-range functional connectivity increased with age in TD group, but not in the ASD group. Our findings suggest that both local and long-range functional connectivity are abnormally reduced in children with ASD when processing inverted faces, and that the pattern of abnormalities associated with the processing of inverted faces differs from the pattern of upright faces in ASD, likely due to the presumed greater reliance on top-down regulations necessary for efficient processing of inverted faces. LAY SUMMARY: We found alterations in the neurophysiological responses to inverted faces in children with ASD, that were not reflected in the evoked responses, and were not observed in the responses to upright faces. These alterations included reduced local functional connectivity in the fusiform face area (FFA), and decreased long-range alpha-band modulated functional connectivity between the FFA and the left IFG. The magnitude of long-range functional connectivity between the FFA and the inferior frontal gyrus was correlated with the severity of ASD.
Autism research : official journal of the International Society for Autism Research, 2021 · doi:10.1037/h0027474