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From local to global processing: the development of illusory contour perception.

Kritika Nayar1, John Franchak2, Karen Adolph2

  • 1Center for Neural Science, New York University, New York, NY 10003, USA.

Journal of Experimental Child Psychology
|December 17, 2014
PubMed
Summary

Children gradually develop global visual processing skills between ages 4 and 7. Young children focus on image details, while older children and adults perceive the whole image, indicating a shift from local to global processing.

Keywords:
Eye trackingGlobal form perceptionGlobal processingKanizsa illusory contoursMatch-to-samplePerceptual development

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Area of Science:

  • Developmental psychology
  • Cognitive neuroscience
  • Visual perception

Background:

  • Global visual processing is crucial for scene segmentation and object recognition.
  • Local processing prioritizes image details over the overall percept.
  • Previous research on the development of global processing has yielded inconclusive results.

Purpose of the Study:

  • To assess the developmental trajectory of global visual processing in children aged 3 to 10.
  • To investigate the transition from local to global visual processing strategies.
  • To utilize Kanizsa illusory contours as a novel method for evaluating global perception.

Main Methods:

  • Employed a match-to-sample paradigm using Kanizsa illusory contours.
  • Measured participant responses on a touch-sensitive screen.
  • Monitored eye position using a head-mounted eye tracker.

Main Results:

  • Youngest children (3-year-olds) performed near chance on illusory contour discrimination.
  • Children aged 7-8 and adults demonstrated near-perfect performance.
  • A developmental shift was observed, with younger children focusing on image inducers and older participants on the illusory form itself.

Conclusions:

  • Global visual processing shows a prolonged developmental trajectory, with a significant transition occurring between 4 and 7 years of age.
  • Evidence supports a gradual shift from local to global visual processing strategies during childhood.
  • The findings provide new insights into the maturation of visual perception in children.