Task-Related Aperiodic EEG (1/f) Activity in Autism.
Magdalena Matyjek, Salvador Soto Faraco, Claudia Alvarez Martin and 1 others
PMID 42460540WHAT IT FOUND
In autistic adults, a measure of the brain's balance between excitation and inhibition shifted with task demands, becoming steeper during a word-identification task than during passive viewing.
Non-autistic adults showed no such shift. The difference disappeared when each person's own variability was modelled.
Key findings
01Across all participants, the background EEG slope was steeper during the active word task than during passive picture viewing, which the authors read as more inhibition while doing a task.
02The change between tasks was carried by the autistic group: their slopes became significantly steeper in the active versus the passive task, while the non-autistic group showed no significant difference between the two tasks. In the first model the non-autistic group had steeper slopes overall, but that group difference was gone once age and sex were taken into account.
03When the model was changed to let each person's response to the two tasks differ, it fitted the data better but none of the effects remained significant; the authors describe this as reflecting large differences between individuals and the need for larger samples.
STILL TO COME
How it was doneWhat they found
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What it does not show
The passive and active tasks differed in several ways at once (a goal was present or absent, the pictures were static or moving, the input was or was not language), so the study cannot say which of these produced the group difference. Everyone did the passive task first and the active task second, because the data came from an existing study, so tiredness or getting used to the set-up could have contributed to the change between tasks. When the analysis allowed each person's response to the tasks to vary, the group difference disappeared, which suggests the sample was too small for an effect that differs widely between individuals, and that any group-level difference is not uniform. Only the silent visual part of the active task was used, so nothing here speaks to hearing speech or to seeing and hearing it together. Medication use, other conditions and time of day were not recorded, and all of these can affect this EEG measure. Participants had no intellectual disability and could perform the task, so the results say nothing about autistic adults with intellectual disability or about people who could not complete the task. Group differences in this EEG measure have been inconsistent across earlier studies, and the authors themselves note that some analyses of large datasets find almost no replicable differences.
Declared interests
Public and charitable funding only: an EU Horizon 2020 Marie Sklodowska-Curie grant, the Spanish state research agency (Agencia Estatal de Investigacion) with FEDER funds, and a Catalan government AGAUR grant. The authors declare no conflicts of interest. No company that sells a treatment was involved.
The easy way to misread this
Do not read the steeper EEG signals in the autistic group as an established brain signature of autism. The difference was significant only in the simpler analyses; when the model allowed each person to respond to the two tasks in their own way, no effect remained, and the authors themselves say larger samples are needed. Nothing here was measured in daily life or linked to how anyone functions.
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