# Toward a Causal Science of Early Play?

## TL;DR

This paper argues for using experiments to understand how children's physical play affects their cognitive development, rather than just observing it.

## Contribution

The paper proposes experimental designs and technologies to establish causal links between embodied play and cognitive development in children.

## Key findings

- Current evidence on the cognitive benefits of play is mostly correlational and lacks causal clarity.
- Emerging technologies like motion capture and wearable eye-tracking can help study play in natural settings.
- Proposed interventions include varying toys and motor demands to test effects on attention and problem-solving.

## Abstract

Young children across the globe devote much of their early years to physically engaging with the world—stacking, climbing, scribbling, and tinkering with objects. Although this embodied play is widely believed to fuel key cognitive processes like attention, memory, and executive function, most supporting evidence remains descriptive or correlational. Here, we review findings from embodied cognition research and highlight why direct experimental manipulations—rather than observations alone—are critical to demonstrating whether and how infants’ and children’s sensorimotor engagements shape their cognitive trajectories. We discuss emerging technologies (e.g., motion capture, wearable eye‐tracking) that can assess play in natural contexts, along with the use of embodied computational models for testing the impact of altered object affordances and caregiver scaffolding. We propose designs for real‐world interventions such as rotating different types of toys, systematically modifying motor demands, and tracking outcomes in attention and problem‐solving, which can bring new causal clarity to developmental science. We argue that a causal science of play will have broad implications for early education, policy, and intervention programs that aim to transform the theory of embodied cognition into practical benefits for children's learning and development.