How does restricted and repetitive behavior relate to language and cognition in typical development?

Area of Science:

• Developmental Psychology
• Child Psychology
• Neurodevelopmental Disorders

Background:

• Restricted and repetitive behaviors (RRBs) are a diagnostic criterion for autism spectrum disorder (ASD).
• Understanding the early developmental impact of RRBs is crucial for early intervention.
• Two distinct types of RRBs exist: sensory/motor behaviors and rigidity/routines/restricted interests.

Purpose of the Study:

• To investigate the relationship between RRBs at 26 months and later social cognition and language development.
• To differentiate the impact of sensory/motor RRBs versus rigidity/routines/restricted interests on child development.
• To explore potential pathways linking early RRBs to developmental outcomes.

Main Methods:

• Longitudinal study with N=203 children at 26 months and N=161 followed up.
• Assessed RRBs using two scales: sensory/motor behaviors and rigidity/routines/restricted interests.
• Measured language at 26 and 51 months; social cognition (symbolic play, theory of mind) at 26, 51, and 61 months.

Main Results:

• Sensory and motor repetitive behaviors negatively correlated with language performance at 26 and 51 months.
• Sensory and motor repetitive behaviors were associated with lower instructed symbolic play at 26 months and theory of mind at 51 and 61 months.
• Rigidity/routines/restricted interests showed no significant associations with concurrent or later language and social cognition.

Conclusions:

• Early sensory and motor repetitive behaviors may negatively impact language and social cognition development, including theory of mind.
• Path analyses suggest sensory/motor RRBs influence receptive language and theory of mind, with cascading effects on later theory of mind.
• The findings highlight the importance of differentiating RRB subtypes in understanding their developmental consequences.