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Kasey C Soska1, Jaya Rachwani1, Claes von Hofsten2

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Summary
This summary is machine-generated.

Infants and adults quickly plan object retrieval even during body turns. Reach planning depends on visual availability, not fixation, showing similar coordination across the lifespan.

Keywords:
infantobject prehensionplanningprospective controlreaching

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Area of Science:

  • Developmental psychology
  • Motor control
  • Cognitive neuroscience

Background:

  • Skilled object retrieval necessitates seamless integration of perceptual and motor systems.
  • Coordination becomes complex during dynamic body repositioning and concurrent visual search for targets.

Purpose of the Study:

  • To investigate how infants and adults coordinate reaching and visual search during body turns.
  • To determine the role of visual information availability versus target fixation in planning reaches during body movement.

Main Methods:

  • A pivot paradigm was employed, passively rotating participants 180° towards targets at varying locations.
  • Experiments utilized head-mounted eye-tracking and motion tracking to record reach planning and visual attention.
  • Participants included infants (6–15 months) and adults.

Main Results:

  • Infants and adults demonstrated rapid prehension planning, executing reaches mid-turn.
  • Reach scaling was adjusted based on target location relative to the direction of body turn.
  • Reach planning was influenced by target appearance in the visual field, not by direct target fixation.

Conclusions:

  • Fast, efficient perceptual-motor coordination enables flexible object retrieval in infants.
  • The underlying constraints for perceptual-motor coordination during dynamic tasks appear consistent from infancy through adulthood.