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Related Concept Videos

Anatomical Positions01:11

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In anatomy, several standard anatomical positions are used as references for describing the position and orientation of different body parts. These positions help provide a common frame of reference when discussing anatomical structures. The anatomical position is the standard reference point for describing the body's position and orientation. In this position:
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Related Experiment Video

Updated: Jun 8, 2026

Quantifying Learning in Young Infants: Tracking Leg Actions During a Discovery-learning Task
11:18

Quantifying Learning in Young Infants: Tracking Leg Actions During a Discovery-learning Task

Published on: June 1, 2015

Infants Adapt Sitting to a Decreasing Base of Support.

Jaya Rachwani1, Orit Herzberg2, Karen E Adolph2

  • 1Department of Physical Therapy, Hunter College, City University of New York, New York, New York, USA.

Infancy : the Official Journal of the International Society on Infant Studies
|June 6, 2026
PubMed
Summary
This summary is machine-generated.

Infants learn to balance by adjusting their base of support. Improved trunk control helps infants maintain stability on challenging surfaces, preparing them for future motor skills.

Keywords:
base of supportinfantpostural controlsitting

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Published on: August 25, 2014

Area of Science:

  • Developmental psychology
  • Motor control
  • Infant biomechanics

Background:

  • Infants progressively develop postural control as they mature.
  • Acquiring balance involves adapting to a smaller base of support.

Purpose of the Study:

  • To investigate the development of postural control in infants transitioning from floor sitting to bench sitting.
  • To determine the role of trunk control in maintaining balance with a reduced base of support.

Main Methods:

  • Systematic testing of postural control in 6- to 9-month-old infants (N=25).
  • Infants were gradually lowered from a floor sit to a bench sit by decreasing platform height.
  • Balance was assessed as the platform height decreased, challenging infants' base of support.

Main Results:

  • All infants maintained balance in a bench sit when their feet were on the ground.
  • Infants' trunk control significantly predicted their ability to balance with feet dangling.
  • Increased trunk control correlated with backward leaning (increased trunk-thigh angle) to maintain balance.

Conclusions:

  • Improvements in trunk control enable infants to adopt more efficient postural strategies.
  • Flexibility and adaptability in trunk control are crucial for mastering sitting and preparing for advanced motor development.
  • This study highlights the importance of trunk stability in navigating novel postural challenges during infancy.