Play: early and eternal.

Area of Science:

• Primate Ethology
• Developmental Psychology
• Behavioral Biology

Background:

• Play behavior is crucial for development in many species.
• Understanding the origins and patterns of primate play offers insights into social and cognitive development.
• Previous research has not fully characterized the fundamental forms of primate play.

Purpose of the Study:

• To systematically investigate the development of play behavior in rhesus monkey infants over 12 weeks.
• To identify and examine a basic form of play, termed self-motion play (peragration).
• To analyze the developmental relationships between individual and social self-motion play, and the role of apparatus.

Main Methods:

• A 12-week observational study of eight socially reared rhesus monkey infants.
• Categorization of self-motion play into five distinct patterns.
• Comparison of individual versus social peragration play frequency and timing.
• Assessment of the influence of apparatus on play behavior.

Main Results:

• Self-motion play (peragration) was identified as a primary play form, distinct from locomotion and exploration.
• Individual self-motion play appeared earlier and increased in frequency more than social self-motion play.
• Apparatus was essential for significant increases in social self-motion play.
• Self-motion play was independent of other play forms between 90 and 180 days of age.

Conclusions:

• Self-motion play is a fundamental and persistent primate play behavior with potential reinforcing properties.
• The development of self-motion play follows distinct individual and social trajectories, influenced by environmental factors like apparatus.
• Findings suggest therapeutic implications for self-motion play in primate development.