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Related Experiment Video

Updated: Jun 22, 2026

Behavioral Assessment of Manual Dexterity in Non-Human Primates

Behavioral Assessment of Manual Dexterity in Non-Human Primates

Published on: November 11, 2011

Role differentiated bimanual manipulation during a lab-based free play task.

Paige A Thompson¹, Amanda J Arnold¹, Satyajit Ambike¹

¹Department of Health and Kinesiology, Purdue University, USA.

Infant Behavior & Development

|January 31, 2025

Summary

This summary is machine-generated.

Infants develop complex bimanual actions like role differentiated bimanual manipulation (RDBM) during play. This study found infants preferred sitting and lightweight toys for RDBM in a naturalistic setting.

Keywords:

Infants Motor development Object interactions Posture

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Last Updated: Jun 22, 2026

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Area of Science:

Developmental Psychology
Motor Skill Acquisition
Infant Behavior

Background:

Infants interact with numerous objects daily, developing complex bimanual actions.
Role differentiated bimanual manipulation (RDBM) is a key developmental milestone.
Previous RDBM studies in structured settings limit ecological validity.

Purpose of the Study:

To assess RDBM prevalence in a naturalistic free-play setting.
To investigate the influence of posture, toy size, and toy weight on infant RDBM.
To understand RDBM emergence in everyday object interactions.

Main Methods:

Infants (13- and 24-month-olds) participated in a 20-minute free play task.
The task mimicked everyday object interactions to observe RDBM.
Factors like posture, toy size, and weight were analyzed for their impact on RDBM.

Main Results:

RDBM occurred less frequently in the naturalistic setting compared to structured labs.
Infants favored lightweight toys and sitting postures for RDBM.
13-month-olds preferred small toys; 24-month-olds used small, medium, and large toys.

Conclusions:

Lab-based free play provides a more naturalistic context for studying infant RDBM.
Posture and toy characteristics influence the development of complex bimanual skills.
Findings advance understanding of how infants acquire sophisticated motor behaviors in everyday environments.