Oscillatory traveling waves during visual entrainment in autistic and neurotypical adults

Key findings from this study

• The study found that neurotypical adults exhibited increased backward (frontal-to-occipital) traveling waves during visual entrainment, consistent with enhanced top-down prediction.
• The researchers demonstrate that autistic adults showed a marked increase in forward (occipital-to-frontal) traveling waves during the same task, indicating stronger bottom-up sensory drive.
• The authors report that traveling wave direction during visual entrainment reflects hierarchical communication patterns that differentiate typical from atypical predictive processing in perception.

Overview

This study examined traveling wave dynamics during visual entrainment in neurotypical and autistic adults using scalp EEG. Traveling waves propagate neural oscillations through brain regions along the anterior-posterior axis. The predictive coding framework posits that backward waves (frontal-to-occipital) convey predictions while forward waves reflect sensory processes. The research compared 25 neurotypical and 24 autistic spectrum disorder participants to test whether perceptual differences align with predictive coding accounts.

Methods and approach

The researchers analyzed traveling wave patterns during a visual entrainment task using scalp EEG in neurotypical adults (N=25) and autistic adults (N=24). The study measured oscillatory dynamics along the anterior-posterior axis during rhythmic visual stimulation and rest conditions. Analysis focused on the directional propagation of neural oscillations at the entrained frequency.

Results

Neurotypical participants replicated previous findings, showing increased backward waves during rhythmic visual stimulation consistent with enhanced top-down predictions. The autistic group exhibited the opposite pattern, demonstrating pronounced increases in forward waves at the entrained frequency during visual stimulation. This directional difference suggests differential hierarchical communication across brain regions between groups. The forward wave increase in autistic participants aligns with bottom-up sensory signaling dominance, indicating an imbalance between predictive signals and sensory evidence processing.

Implications

These findings provide electrophysiological evidence supporting predictive coding theories of atistic perception. The results suggest that autistic individuals exhibit attenuated top-down predictive signaling and relatively enhanced bottom-up sensory drive during visual processing. Traveling waves emerge as a sensitive neural marker capable of discriminating hierarchical signaling patterns between typical and atypical perceptual systems.

The study's characterization of directional wave propagation offers a quantifiable measure of predictive versus feedforward processing imbalances. Future research might leverage traveling wave analysis to investigate predictive processing across additional sensory domains or cognitive tasks in autistic populations. Understanding these oscillatory dynamics may inform mechanistic accounts of sensory hypersensitivity and perceptual differences documented in autism spectrum disorder.

Scope and limitations

This summary is based on the study abstract and available metadata. It does not include a full analysis of the complete paper, supplementary materials, or underlying datasets unless explicitly stated. Findings should be interpreted in the context of the original publication.