Journal
CHILD DEVELOPMENT
Volume 84, Issue 3, Pages 810-816Publisher
WILEY
DOI: 10.1111/cdev.12000
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Funding
- NICHD NIH HHS [R01 HD067581, 5R01HD067581, 5R01HD043842, R01 HD043842] Funding Source: Medline
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The current study examines the developmental trajectory of banging movements and its implications for tool use development. Twenty (6- to 15-month-old) infants wore reflective markers while banging a handled cube; movements were recorded at 240Hz. Results indicated that through the second half-year, banging movements undergo developmental changes making them ideally suited for instrumental hammering and pounding. Younger infants were inefficient and variable when banging the object: Their hands followed circuitous paths of great lengths at high velocities. By 1year, infants showed consistent and efficient straight up-down hand trajectories of smaller magnitude and velocity, allowing for precise aiming and delivering dependable levels of force. The findings suggest that tool use develops gradually from infants' existing manual behaviors.
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