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Infants perceive two-dimensional shape from horizontal disparity

Stephanie Braun1, Michael Kavšek1

  • 1University of Bonn, Department of Psychology, Unit of Developmental and Educational Psychology, Kaiser-Karl-Ring 9, 53111 Bonn, Germany.

Infant Behavior & Development
|August 12, 2018
PubMed

Insights

Five-month-old infants can detect shape from stereoscopic vision, demonstrating sensitivity to horizontal disparity. This visual perception skill develops by five months of age.

Area of Science:

  • Developmental Psychology
  • Visual Perception
  • Infant Cognition

Background:

  • Infants develop sensitivity to horizontal disparity, crucial for depth perception, around 2 months of age.
  • By 3-4 months, infants use stereoscopic cues to discern depth variations in objects.

Purpose of the Study:

  • To investigate if infants can perceive two-dimensional shape using crossed horizontal disparity information.
  • To determine the age at which infants become sensitive to shape defined by stereoscopic cues.

Main Methods:

  • Habituation study with 4- and 5-month-old infants using dynamic random dot stereograms.
  • Infants were habituated to either a cross or a square outline presented on an autostereoscopic monitor.
  • Post-habituation novelty preference assessed using both shapes to measure recognition.

Main Results:

  • Five-month-old infants showed a significant novelty preference for the unfamiliar shape.
  • Four-month-old infants did not display a significant novelty preference.
  • This indicates 5-month-olds' sensitivity to shape defined by horizontal disparity.

Conclusions:

  • Five-month-old infants are sensitive to horizontal disparity cues that specify shape.
  • This finding advances our understanding of the developmental trajectory of stereoscopic shape perception in infancy.

Keywords:
Binocular visionHorizontal disparityInfant visionPerceptual developmentShape perceptionStereoscopic vision

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