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Related Experiment Videos

Preparation for grasping an object: a developmental study.

C von Hofsten1, L Rönnqvist

  • 1Department of Psychology, Umeå University, Sweden.

Journal of Experimental Psychology. Human Perception and Performance
|November 1, 1988
PubMed
Summary
This summary is machine-generated.

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Visually guided grasping develops early, with infants anticipating contact. While adults adjust grip timing to target size, infants show developmental changes in this visual control strategy.

Area of Science:

  • Developmental Psychology
  • Motor Control
  • Human Movement Science

Background:

  • Visually guided grasping is crucial for object interaction.
  • Understanding the developmental trajectory of this skill provides insights into sensorimotor integration.

Purpose of the Study:

  • To investigate the development of visually controlled grasping actions in infants and adults.
  • To compare infant grasping strategies with adult criteria.
  • To determine the influence of target size on grasping timing and hand shaping.

Main Methods:

  • Utilized an optoelectronic technique (SELSPOT) to measure hand aperture during reaching.
  • Monitored the distance between the thumb and index finger to quantify hand opening and closing.
  • Conducted experiments with adult participants and infant groups aged 5-6, 9, and 13 months.

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Main Results:

  • Adults initiated hand closure before contact, adjusting timing based on target size.
  • Infants (5-6, 9, 13 months) also used visual control, anticipating grasp.
  • Younger infants grasped closer to contact; older infants and adults showed similar anticipatory timing. Target size did not influence infant grasp timing, but hand opening adjusted in 9- and 13-month-olds.

Conclusions:

  • Visually controlled grasping develops progressively, with infants demonstrating anticipatory actions.
  • Grasping strategies mature, with older infants adopting adult-like timing relative to target contact.
  • Hand shaping to target size emerges during infancy, indicating developing visual-motor coordination.