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Vision is the result of light being detected and transduced into neural signals by the retina of the eye. This information is then further analyzed and interpreted by the brain. First, light enters the front of the eye and is focused by the cornea and lens onto the retina—a thin sheet of neural tissue lining the back of the eye. Because of refraction through the convex lens of the eye, images are projected onto the retina upside-down and reversed.
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Investigating the Deployment of Visual Attention Before Accurate and Averaging Saccades via Eye Tracking and Assessment of Visual Sensitivity
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Development of Relative Disparity Sensitivity in Human Visual Cortex.

Anthony M Norcia1, Holly E Gerhard2, Wesley J Meredith2

  • 1Department of Psychology, Stanford University, Stanford, California 94305 amnorcia@stanford.edu.

The Journal of Neuroscience : the Official Journal of the Society for Neuroscience
|May 6, 2017
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Summary

Human infants show immature relative disparity processing for depth perception, with adult-like stereopsis developing by age 4-7. This study reveals key developmental stages in visual depth sensing.

Keywords:
binocular visionmaturationstereopsisvisual evoked potentials

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Area of Science:

  • Developmental neuroscience
  • Visual perception
  • Human infant cognition

Background:

  • Stereopsis, or depth perception, is crucial for spatial judgment in adults.
  • Adults rely on relative binocular disparity, especially horizontal disparities, for fine depth discrimination.
  • Infant sensitivity to absolute disparity is known, but the development of relative disparity processing remains unclear.

Purpose of the Study:

  • To investigate the developmental trajectory of relative disparity sensitivity in human infants and children.
  • To compare infant and adult performance in discriminating horizontal and vertical disparities.
  • To explore the factors contributing to immature stereopsis in early infancy.

Main Methods:

  • Measured disparity-tuning functions for horizontal and vertical disparities using visual evoked potentials (VEP).
  • Assessed relative disparity thresholds in 4- to 6-month-old infants and 4- to 7-year-old children.
  • Manipulated interocular correlation to evaluate the role of coarse-scale relative disparity cues.

Main Results:

  • Infants (4-6 months) showed immature relative disparity processing, with similar thresholds for horizontal and vertical disparities.
  • Infant horizontal disparity thresholds were approximately 10 times higher than adults, while vertical disparity thresholds were only 4 times higher.
  • Children (4-7 years) exhibited adult-like horizontal relative disparity thresholds (∼0.5 arcmin), indicating significant developmental improvement.

Conclusions:

  • Human stereopsis based on relative disparity is quantitatively and qualitatively immature in 4- to 6-month-old infants.
  • The development of specialized relative disparity processing, particularly for horizontal disparities, continues through early childhood.
  • Relative disparity sensitivity reaches adult-like levels by 4-7 years of age.