Temperament and its Association with Autism Symptoms in a High-risk Population

Area of Science:

• Developmental Psychology
• Neurodevelopmental Disorders
• Genetics

Background:

• Infants with an older sibling diagnosed with autism spectrum disorder (ASD) have an elevated risk.
• Understanding early behavioral differences in high-risk infants is crucial for early identification and intervention.
• Temperament, a set of early-appearing individual differences in reactivity and self-regulation, is a potential marker for neurodevelopmental trajectories.

Purpose of the Study:

• To investigate temperament differences between high-risk and low-risk infants.
• To examine the relationship between early temperament and the development of Effortful Control.
• To determine if early temperament predicts later autism spectrum disorder (ASD) symptoms.

Main Methods:

• Longitudinal study of 383 high-risk infants (older sibling with ASD) and 162 low-risk controls.
• Infant Behavior Questionnaire (12 months) and Toddler Behavior Assessment Questionnaire (24 months) assessed temperament.
• Autism Diagnostic Interview-Revised (ADI-R) and Autism Diagnostic Observation Schedule (ADOS) used for blind ASD diagnostic assessment at 36 months.

Main Results:

• Significant differences in temperament traits and higher-order factor structures were found between high-risk and low-risk groups.
• Early reactive temperament was linked to the development of Effortful Control in the high-risk sample.
• Effortful Control at 24 months significantly predicted later ASD symptoms at 36 months.

Conclusions:

• Temperament differences are evident in infants at high risk for ASD.
• Effortful Control emerges as a critical factor in the developmental pathway toward ASD.
• Early temperament characteristics may serve as a valuable endophenotype for identifying individuals at risk for ASD.