How distinct autism and schizotypal trait dimensions influence neural predictive processing: An Event-related...

Area of Science:

• Neuroscience
• Psychiatry
• Cognitive Science

Background:

• Predictive Processing (PP) framework offers insights into neural mechanisms of autism and schizophrenia spectra.
• Understanding neural variability in these conditions is crucial for targeted interventions.
• Previous research highlights potential differences in brain responses to unexpected events.

Purpose of the Study:

• To investigate neural responses to unexpected events in individuals with autism and schizophrenia traits.
• To examine the influence of task difficulty on brain responses (P300 amplitudes) across sensory modalities.
• To explore associations between autistic and schizotypal traits and specific electroencephalography (EEG) components.

Main Methods:

• 122 participants completed EEG recordings during visual and auditory oddball tasks with varying difficulty.
• Self-report measures assessed autistic and schizotypal traits.
• Bayesian analyses were used to evaluate the evidence for associations between traits and neural responses.

Main Results:

• Increased task difficulty reduced P300 amplitudes in both sensory modalities.
• Higher autistic traits (Restricted Interests, Detail Orientation) correlated with enhanced N2 amplitudes in a difficult visual task, but not P300.
• Bayesian analyses found moderate evidence against reliable associations between P300 amplitudes and autistic traits or schizotypy.

Conclusions:

• Neural responses to unexpected events, particularly P300, may not be reliably altered by autistic traits or schizotypy.
• Early auditory N1-P2 components showed weak, task-dependent links to autistic communication difficulties, but not schizotypal traits.
• Findings support symptom-specific research and suggest distinct neural processes for social versus non-social dimensions in autism, aligning with PP framework nuances.