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Double dissociation between perception and action in children.

Erez Freud1, Nahal Binur2, Ashish Srikanth1

  • 1Department of Psychology and Centre for Vision Research, York University, Toronto, Ontario M3J 1P3, Canada.

Journal of Experimental Child Psychology
|October 4, 2020
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Summary
This summary is machine-generated.

Children aged 5-8 years show adult-like vision for action despite ongoing development. This study reveals key mechanisms for dissociating vision for perception and action are present early in childhood.

Keywords:
ActionMotor developmentPerceptionPonzo illusionTwo visual pathwaysViusomotor

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Area of Science:

  • Cognitive Neuroscience
  • Developmental Psychology
  • Visual Perception

Background:

  • Established functional dissociation between vision for perception and vision for action.
  • Developmental trajectory of this visual dissociation remains unclear.

Purpose of the Study:

  • Directly compare sensitivity of grasping (action) and perceptual estimations to real and illusory object sizes.
  • Investigate the developmental emergence of the perception-action dissociation.

Main Methods:

  • Utilized the Ponzo illusion to create discrepancies between real and perceived object sizes.
  • Assessed size discriminations and grasping apertures in children (5-8 years) and adults.
  • Compared perceptual estimations with action-based grasping behavior.

Main Results:

  • Adult grasping apertures scaled with physical object size, unaffected by the illusion, while perception was deceived.
  • Children outperformed adults in perceptual size discrimination.
  • Children demonstrated adult-like grasping and perceptual estimations, indicating a perception-action dissociation.

Conclusions:

  • Key mechanisms supporting the perception-action dissociation are present in early childhood.
  • While not fully mature, these visual functions show early separation in development.
  • Suggests foundational elements for distinct visual processing streams are established early.