Visual Cortical Response Variability in Infants at High Familial Likelihood for Autism.

Area of Science:

• Neuroscience
• Developmental Psychology
• Pediatrics

Background:

• Visual processing matures rapidly in infancy, influencing cognitive, language, and motor development.
• Visual evoked potentials (VEPs) offer a non-invasive method to assess visual system maturation.
• Infants with a familial likelihood for autism exhibit heterogeneous developmental trajectories.

Purpose of the Study:

• To investigate the relationship between VEP measures and developmental outcomes in infants at high familial risk for autism.
• To determine if trial-to-trial variability in VEPs is a sensitive neural marker of developmental trajectories.

Main Methods:

• Pattern-reversal VEPs were recorded in 177 infants at 6 months and 132 at 12 months.
• Developmental skills were assessed at 24 months using the Bayley Scales of Infant and Toddler Development (Bayley-III).
• General linear models examined associations between VEP components (P1 latency variability) and developmental scores.

Main Results:

• VEPs showed age-appropriate morphology and developmental changes from 6 to 12 months.
• Greater trial-to-trial P1 latency variability at both timepoints was linked to higher cognitive and language scores at 24 months.
• P1 latency variability was a stronger predictor of outcomes than mean P1 latency.

Conclusions:

• Temporal variability in early visual cortical responses may reflect adaptive sensory circuit flexibility.
• VEP variability serves as a sensitive neural correlate of infant cognitive and language development.
• VEP-based biomarkers provide insights into how early sensory processing supports individual developmental differences.