Disentangling oscillatory and aperiodic neural activity in autism: A spectral parameterization analysis of neurofeedback intervention.

This was a randomised controlled trial — people were assigned to treatments by chance, which is the most reliable way to tell whether a treatment itself caused a change.

It involved 40 people — a modest group, enough to be interesting but not enough to settle a question on its own.

The researchers concluded: "Alpha-training NFB was associated with improvements in caregiver-rated behavioral scores and modulated spectral features of resting-state EEG in children with ASD. These findings validate the utility of spectral parameterization markers in evaluating neuromodulatory interventions."

This record does not state:

• the ages of the people who took part
• how long the study ran

This is a plain-language summary of one paper's abstract, not medical advice. Talk to your child's clinician before changing anything.

Journal: Behavioural brain research

Year: 2026

Design: Randomized Controlled Trial

Participants: 40

Intervention: Alpha Oscillations

Authors: Yuqi Li, Juanmei Wu, Nan Liu, Xiaoli Li, Tianyi Zhou, Jiannan Kang

BACKGROUND: Autism Spectrum Disorder (ASD) is characterized by atypical neural oscillations and heterogeneous alterations in excitation/inhibition (E/I) balance, the directionality of which varies across individuals, neural circuits, and developmental stages. While Alpha-band neurofeedback (NFB) is a promising intervention, its underlying neurophysiological mechanisms remain unclear, partly due to the conflation of periodic and aperiodic signals in traditional EEG analysis. METHODS: This randomized controlled trial recruited 40 children with ASD, assigned to either an experimental group (Alpha-training NFB) or a no-feedback group. Resting-state EEG and behavioral assessments (SRS, ABC) were collected pre- and post-intervention. We employed spectral parameterization to decompose neural activity into aperiodic (1/f slope, offset) and periodic (periodic alpha power, center frequency) components. RESULTS: NFB training yielded significant behavioral improvements in social cognition and relating skills. Physiologically, the experimental group exhibited a significant steepening of the aperiodic slope (increased exponent), reflecting a reduction in neural noise and potential optimization of inhibitory modulation. Furthermore, we observed enhanced periodic alpha power and an acceleration of the alpha center frequency (ACF), indicative of improved neural efficiency and maturation. These physiological shifts in frontal and occipital regions were significantly correlated with improvements in behavioral scores. CONCLUSION: Alpha-training NFB was associated with improvements in caregiver-rated behavioral scores and modulated spectral features of resting-state EEG in children with ASD. These findings validate the utility of spectral parameterization markers in evaluating neuromodulatory interventions.

Behavioural brain research, 2026

PMID 42492845

DOI 10.1016/j.bbr.2026.116396

This record was extracted from the paper's PubMed abstract and metadata. Full-text methods and risk-of-bias details were not reviewed.