Temperament as an Early Risk Marker for Autism Spectrum Disorders? A Longitudinal Study of High-Risk and Low-Risk...

Area of Science:

• Developmental Psychology
• Neurodevelopmental Disorders
• Pediatric Medicine

Background:

• Autism spectrum disorder (ASD) diagnosis relies on behavioral observation, often after critical developmental periods.
• Early identification of ASD risk is crucial for timely intervention and improved outcomes.
• Temperament, characterized by individual behavioral styles, is being explored as a potential early marker for neurodevelopmental conditions.

Purpose of the Study:

• To investigate parent-reported temperament as an early risk marker for autism spectrum disorder (ASD).
• To examine temperament differences in high-risk (HR) and low-risk (LR) siblings across early development.
• To assess the utility of temperament in predicting ASD diagnosis and identifying infants who do not develop ASD.

Main Methods:

• Longitudinal study of parent-reported temperament in HR (n=170) and LR (n=77) siblings at 8, 14, and 24 months.
• Diagnostic assessment for ASD conducted at 36 months.
• Group-based and machine learning analyses to evaluate temperament's predictive value.

Main Results:

• Significant linear risk gradients in temperament were observed across outcome groups: HR-ASD, HR-Atypical, HR-Typical, and LR siblings.
• Temperament profiles significantly differed between outcome groups (0.03 ≤ ηp² ≤ 0.34).
• Machine learning models accurately identified HR infants without ASD but not HR-ASD infants at an individual level.

Conclusions:

• Temperament does not facilitate the individual early identification of autism spectrum disorder.
• A discrepancy exists between group-based trends and individual predictive accuracy for ASD using temperament.
• Temperament may aid in identifying high-risk infants who ultimately do not develop ASD, suggesting its role in understanding developmental trajectories.