Increased alpha power in autistic adults: Relation to sensory behaviors and cortical volume.
Stronger resting alpha brain waves in autistic adults track with sensory issues and cortical volume, pointing to sensory-friendly environments as low-cost help.
01Research in Context
What this study did
Bertelli et al. (2025) placed a small cap of EEG wires on autistic and non-autistic adults.
The team watched alpha waves, the brain’s idle rhythm, while people sat still.
They also took brain scans and asked each adult how lights, sounds, and textures feel.
What they found
Autistic adults showed stronger alpha power than their peers.
Higher alpha power lined up with more sensory sensitivities and with thicker cortex in some spots.
No therapy was given; the study only mapped the link.
How this fits with other research
Tost et al. (2024) saw EEG shifts in girls with Rett after short game and learning tasks.
Both papers show EEG can flag neural change, but Bertelli et al. (2025) ties a resting trait to lifelong sensory style, while Tost et al. (2024) track moment-to-moment gains.
Muniandy et al. (2022) found that autistic adults who cope poorly feel more daily stress.
Bertelli et al. (2025) adds a brain angle: the same group may carry high alpha power, giving you two windows—brain and survey—to spot risk.
Audras-Torrent et al. (2021) split autistic children by WISC-V profiles; together with Bertelli et al. (2025) the picture is clear: look past the diagnosis label and measure separate traits—cognitive, sensory, neural—to plan support.
Why it matters
You can’t see alpha power without EEG, but you can ask about sensory pain right now.
If an adult client reports buzzing lights or itchy clothes, remember their brain may be running a louder idle rhythm.
Use this as extra reason to offer sensory breaks, dimmer rooms, or noise-cancel gear while you work on social or job skills.
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02At a glance
03Original abstract
Alpha-band (~10 Hz) neural oscillations, crucial for gating sensory information, may offer insights into the atypical sensory experiences characteristic of autism spectrum disorder (ASD). We investigated alpha-band EEG activity in autistic adults (n = 29) compared with a nonautistic group (n = 23) under various stimulus-driven and resting-state conditions. The autistic group showed consistently higher alpha amplitude across all time points. In addition, there was proportionally more suppression of alpha at stimulus onset in the autistic group, and alpha amplitude in this stimulus-onset period correlated with sensory behaviors. Recent research suggests a link between subcortical structures' volume and cortical alpha magnitude. Prompted by this, we explored the association between alpha power and the volume of subcortical structures and total cortical volume in ASD. Our findings indicate a significant correlation with total cortical volume and a group by hippocampal volume interaction, pointing to the potential role of anatomical structural characteristics as potential modulators of cortical alpha oscillations in ASD. Overall, the results highlight altered alpha in autistic individuals as potentially contributing to the heightened sensory symptoms in autistic compared with nonautistic adults.
Autism research : official journal of the International Society for Autism Research, 2025 · doi:10.1167/jov.23.9.5460