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Reduced perceptual dimensionality in extrafoveal vision

M Jüttner1, I Rentschler

  • 1Institut für Medizinische Psychologie, Universität München, Germany. martin@groucho.imp.med.uni-muenchen.de

Vision Research
|April 1, 1996
PubMed
Summary

Human visual perception differs between central (foveal) and peripheral (extrafoveal) viewing. Peripheral vision has a lower dimensional representation, which learning can partially improve but not fully resolve.

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Area of Science:

  • Visual perception
  • Computational neuroscience
  • Human psychophysics

Background:

  • Human observers classify compound Gabor signals.
  • Classification performance is analyzed using a probabilistic model.
  • Inferences are made about internal representations and their temporal evolution.

Purpose of the Study:

  • To investigate human classification behavior for Gabor signals at foveal and extrafoveal positions.
  • To analyze classification performance using a probabilistic model.
  • To infer the structure and dimensionality of internal representations and their changes during learning.

Main Methods:

  • Testing human observers' classification behavior with compound Gabor signals.
  • Analyzing performance using the Rentschler, Jüttner, and Caelli probabilistic classification model.

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  • Inferring internal representation structure, dimensionality, and temporal evolution.

    • Main Results:

    • Foveal and extrafoveal internal representations are intrinsically incommensurable.
    • Extrafoveal representations have lower perceptual dimensionality than foveal ones.
    • Deficits are not renormalized by size scaling but are partially reduced by learning, dependent on practice.

    Conclusions:

    • Structural incommensurability between foveal and extrafoveal representations exists.
    • This incommensurability constrains foveal-extrafoveal interaction.
    • Findings may impact understanding of visual stability across saccadic eye movements.