Early Neurodevelopmental Indicators in Autism Spectrum Disorder

Autism Spectrum Disorder (ASD) is characterised by atypical social communication, restricted interests and repetitive behaviours, rooted in early alterations of brain development. Recent work has sought to pinpoint the first manifestations of these alterations during infancy, before behavioural symptoms become overt. Converging evidence from neurophysiological recordings, imaging and behavioural assessments suggests that disruptions in neural oscillatory dynamics, patterns of connectivity and social attention emerge within the first year of life. For example, atypical maturation of delta and gamma oscillations and hyper- or hypoconnectivity in frontal brain regions appear to mark divergent developmental pathways. Observations of reduced eye contact, shorter epochs of sustained attention to faces and delayed orienting to social cues further indicate early perturbations of the social brain. These findings offer a framework for identifying reliable biomarkers of ASD risk, with potential to guide timely interventions that may harness neural plasticity to improve communication and adaptive outcomes globally. The integration of longitudinal trajectories across multiple modalities underscores the developmental timing of neurobiological changes and highlights the importance of early screening in both high-risk sibling cohorts and broader infant populations.

Research from Nature Portfolio

Longitudinal recordings of resting electroencephalography power across the first three years have revealed that trajectories of neural oscillations during the first postnatal year best distinguish infants who later receive an ASD diagnosis. In particular, deviations in delta and gamma band power trajectories between 3 and 12 months reliably differentiate high-risk infants who go on to develop ASD from those who do not, even before behavioural symptoms emerge. This work emphasises the significance of developmental timing in neural maturation and suggests that early oscillatory markers can inform personalised risk profiles and accelerate the path to diagnosis and intervention.

Early Neurodevelopmental Indicators in Autism Spectrum Disorder publication trend

The graph below shows the total number of articles in early neurodevelopmental indicators in autism spectrum disorder across all publications each year (not limited to Nature Index journals).

Technical terms

Electroencephalography (EEG): non-invasive recording of the brain’s electrical activity, capturing oscillatory power across frequency bands.

Event-related potential (ERP): averaged EEG response time-locked to sensory or cognitive stimuli, reflecting processing stages such as attention and perception.

Functional connectivity: statistical coupling between neural signals in distinct brain regions, indicative of coordinated communication pathways.

High-risk infant: an infant with elevated probability of ASD, commonly due to familial history or early medical risk factors.

Oscillatory dynamics: rhythmic fluctuations in neural activity, often described by frequency bands such as delta (0.5–4 Hz) and gamma (30–100 Hz).

References

1. Longitudinal EEG power in the first postnatal year differentiates autism outcomes. Nature Communications (2019).
2. Developmental pathways to autism: A review of prospective studies of infants at risk. Neuroscience & Biobehavioral Reviews (2013).
3. Infant Neural Sensitivity to Dynamic Eye Gaze Is Associated with Later Emerging Autism. Current Biology (2012).
4. Functional Connectivity in the First Year of Life in Infants at Risk for Autism Spectrum Disorder: An EEG Study. PLOS ONE (2014).