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Updated: Apr 25, 2026

Quantifying Learning in Young Infants: Tracking Leg Actions During a Discovery-learning Task
Published on: June 1, 2015
Just how joint is joint action in infancy?
1Department of Developmental and Comparative Psychology, Max Planck Institute for Evolutionary Anthropology, Leipzig, Germany.
Insights
One-year-old infants possess the social-cognitive skills for joint action, including understanding goals and intentions. This research highlights the early emergence of human cooperation and shared intentionality from infancy.
Area of Science:
- Developmental Psychology
- Social Cognition
- Human Infancy Studies
Background:
- Joint action is fundamental to human social life.
- Previous beliefs suggested infants lacked the prerequisites for true joint action.
- Understanding early cooperation is key to human social development.
Purpose of the Study:
- To investigate the social-cognitive foundations of joint action in 1-year-old infants.
- To examine infants' understanding of goals, intentions, and common knowledge.
- To explore early evidence of commitment and obligation in collaborative tasks.
Main Methods:
- Review of existing empirical evidence on infant social cognition.
- Analysis of infant behaviors in contexts requiring shared intentionality.
- Focus on studies assessing understanding of goals, intentions, and collaborative roles.
Main Results:
- 1-year-old infants demonstrate the ability to read others' goals and intentions.
- Infants show a basic grasp of common knowledge relevant to social interactions.
- Evidence suggests infants possess the motivation and capacity to assist others.
Conclusions:
- Infants by 1 year of age possess the necessary social-cognitive skills for joint action.
- The uniquely human capacity for joint action is evident very early in development.
- Early joint action abilities in infancy lay the groundwork for complex social interactions.
Abstract:
Joint action is central to countless aspects of human life. Here I examine the roots of joint action in infancy. First, I provide evidence that-contrary to popular belief-1-year-old infants do have the social-cognitive prerequisites needed to participate in joint action, even in a relatively strict sense: they can read others' goals and intentions, they have some basic understanding of common knowledge, and they have the ability and motivation to help others achieve their goals. Then I review some evidence of infants' and young children's active participation in different types of joint action, from prelinguistic communication to more instrumental collaborations with others, with a particular focus on whether young children show evidence of an understanding of the commitments and obligations entailed in joint action. I conclude that the uniquely human ability and motivation to participate in joint action is already seen in infants by 1 year of age.
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