Auditory Processing and Electrophysiological Markers in Autism Spectrum Disorders

The processing of auditory information in autism spectrum disorders is characterised by alterations in early sensory stages and higher-order integration. Electrophysiological techniques such as electroencephalography (EEG) and magnetoencephalography (MEG) have revealed atypical evoked responses in primary and secondary auditory regions, including delayed or reduced amplitudes of the M50/M100 components and weakened mismatch negativity. Studies of spontaneous oscillations show imbalances in excitatory-inhibitory coupling reflected by atypical gamma-band power and phase synchronisation. Auditory steady-state responses at 40 Hz are often diminished in autistic individuals, suggesting nonlinear processing deficits in auditory cortex. Repetition suppression paradigms uncover impaired sensory gating and weaker attenuation of responses to repetitive stimuli, while oddball paradigms reveal variations in detection of deviant sounds and orienting to novel events. These electrophysiological markers correlate with language skills, social adaptability and symptom severity, positioning them as candidate biomarkers for early screening and stratification. Multimodal investigations indicate that structural maturation of white matter tracts and neurochemical modulators such as GABA contribute to electrophysiological signatures, underscoring the complex interplay between neurodevelopmental trajectory and sensory processing in autism.

Research from Nature Portfolio

Longitudinal infant studies have demonstrated that early electrophysiological responses to repetitive and deviant sounds predict later adaptive functioning. One investigation employed an oddball paradigm during the first year of life and showed that the degree of repetition and change detection responses in EEG time-frequency measures forecast cognitive abilities and adaptive behaviour at preschool age, independent of head circumference variation. Another ERP study compared infants at high familial risk for autism and language impairment, finding delayed mismatch response latencies in both groups but uniquely enhanced P3 amplitudes in those at risk for autism. These early ERP profiles were associated with expressive vocabulary outcomes and autism-related screening scores, suggesting that specific electrophysiological signatures as early as 12 months could stratify risk and inform tailored interventions.

Auditory Processing and Electrophysiological Markers in Autism Spectrum Disorders publication trend

The graph below shows the total number of articles in auditory processing and electrophysiological markers in autism spectrum disorders across all publications each year (not limited to Nature Index journals).

Technical terms

Event-related potential (ERP): Time-locked electrical response recorded by EEG following a sensory or cognitive event.

Mismatch negativity (MMN): An ERP component reflecting pre-attentive detection of changes in auditory regularities, typically occurring around 100–200 ms after a deviant stimulus.

Gamma-band oscillations: Neural oscillations in the 30–100 Hz range associated with cortical excitation-inhibition balance and perceptual binding.

Auditory steady-state response (ASSR): Continuous entrained oscillatory response to periodic auditory stimuli, used to assess nonlinear neural processing at specific modulation rates.

Oddball paradigm: Experimental design presenting sequences of standard and infrequent deviant stimuli to elicit change detection responses such as MMN and P3a.

References

1. Delayed M50/M100 evoked response component latency in minimally verbal/nonverbal children who have autism spectrum disorder. Molecular Autism (2019).
2. Reduced auditory steady state responses in autism spectrum disorder. Molecular Autism (2020).
3. Exploratory evidence for differences in GABAergic regulation of auditory processing in autism spectrum disorder. Translational Psychiatry (2023).
4. The relationship between gamma-band neural oscillations and language skills in youth with Autism Spectrum Disorder and their first-degree relatives. Molecular Autism (2024).
5. Multimodal Diffusion-MRI and MEG Assessment of Auditory and Language System Development in Autism Spectrum Disorder. Frontiers in Neuroanatomy (2016).
6. EEG repetition and change detection responses in infancy predict adaptive functioning in preschool age: a longitudinal study. Scientific Reports (2023).
7. Distinct ERP profiles for auditory processing in infants at-risk for autism and language impairment. Scientific Reports (2018).
8. Neurophysiological measures of auditory sensory processing are associated with adaptive behavior in children with Autism Spectrum Disorder. Journal of Neurodevelopmental Disorders (2023).
9. Arousal and attention re-orienting in autism spectrum disorders: evidence from auditory event-related potentials. Frontiers in Human Neuroscience (2014).