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Related Experiment Videos

How infants use vision for grasping objects.

M E McCarty1, R K Clifton, D H Ashmead

  • 1Department of Psychology, University of Massachusetts, Amherst 01003-9271, USA. mccarty@psych.umass.edu

Child Development
|August 2, 2001
PubMed
Summary
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Infants use vision to orient their hands for grasping objects, regardless of lighting conditions. Seeing their own hands did not influence this preparatory hand orientation.

Area of Science:

  • Developmental Psychology
  • Infant Motor Control
  • Visual Perception

Background:

  • Understanding how infants develop motor skills is crucial for developmental psychology.
  • Grasping requires precise hand orientation, influenced by visual cues.
  • Previous research suggests vision plays a key role in early motor development.

Purpose of the Study:

  • To investigate the role of vision in infants' preparation for grasping.
  • To determine if infants adjust hand orientation based on object orientation.
  • To examine the influence of lighting conditions and visual feedback of the hand on grasping preparation.

Main Methods:

  • Infants reached for horizontally and vertically oriented rods under varying lighting conditions.
  • Hand orientation was measured before object contact.

Related Experiment Videos

  • Experiments manipulated visual access to the hand and/or object during the reach.

    • Main Results:

    • Infants consistently oriented their hands appropriately for grasping, irrespective of lighting.
    • Hand orientation remained similar whether the object and hand were fully visible or vision was occluded.
    • Removing sight of the hand did not alter preparatory hand orientation.

    Conclusions:

    • Infants utilize visual information about object orientation, or its memory, for hand shaping during reaching.
    • Visual feedback of the hand itself does not significantly impact this preparatory grasping behavior.
    • This study highlights the primary role of object-based visual cues in early motor planning for grasping.