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The developmental roots of the speed-accuracy trade-off

Frank T J M Zaal1, Esther Thelen

  • 1Department of Psychology, Indiana University, IN, USA. f.t.j.m.zaal@rug.nl

Journal of Experimental Psychology. Human Perception and Performance
|December 22, 2005
PubMed

Insights

Infants develop speed-accuracy trade-offs in reaching movements by 7 months, slowing for smaller targets. This motor control emerges before precision grip ability, aiding fine hand control development.

Area of Science:

  • Developmental psychology
  • Motor control
  • Infant motor development

Background:

  • Adult reaching movements exhibit a speed-accuracy trade-off, influenced by reach distance and target size.
  • Understanding the developmental origins of this trade-off in infants is crucial for grasping motor skill acquisition.

Purpose of the Study:

  • To investigate the emergence of the speed-accuracy trade-off in infant reaching movements.
  • To explore the relationship between this trade-off and the development of fine object manipulation skills in infants.

Main Methods:

  • Observing 7-, 9-, and 11-month-old infants as they reached for targets of varying sizes.
  • Analyzing the kinematic properties of infant reaching movements, specifically movement speed in relation to target size.

Main Results:

  • Infants as young as 7 months demonstrated a speed-accuracy trade-off, slowing their reaches towards smaller targets.
  • This motor control strategy was evident prior to the full development of a precision grip.

Conclusions:

  • The emergence of the speed-accuracy trade-off in reaching is not dependent on advanced precision grip abilities.
  • Slowing movements may facilitate the development of fine, distal hand control in infants.

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