Inflexible neurobiological signatures precede atypical development in infants at high risk for autism

Area of Science:

• Neurobiology
• Developmental Psychology
• Infant Movement Analysis

Background:

• Variability in neurobiological signatures is common in early life.
• The connection between early life variability and adverse developmental milestones in humans is not well understood.
• Autism Spectrum Disorder (ASD) risk is associated with familial factors.

Purpose of the Study:

• To investigate how signal and noise levels in movement signatures during infancy influence early development.
• To examine differences in movement patterns between infants at High Risk (HR) and Low Risk (LR) for ASD.
• To determine if movement patterns predict delays in early learning trajectories.

Main Methods:

• Studied 71 healthy, typically developing infants (HR or LR for ASD) during their first year.
• Analyzed spontaneous head movements and movement variability during different conditions (e.g., sleep, language listening).
• Validated findings using data from 1,445 infants in representative infant-sibling studies.

Main Results:

• Delays in developmental trajectories for HR infants were predicted by poorer stochastic movement patterns at 1-2 months.
• HR infants showed less distinct movement patterns between conditions (language vs. sleep) compared to LR infants.
• This lack of movement diversity in HR infants suggests context-inflexible processing of environmental information.

Conclusions:

• Atypical or inflexible sensorimotor systems and state transitions in early infancy may hinder the ability to extract crucial sensory information.
• This difficulty in processing sensory input precedes and contributes to atypical brain development trajectories observed later in toddlerhood.
• It is the inflexibility, rather than the level of variability itself, that appears detrimental to early development in infants at risk for ASD.