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The computational exploration of visual word recognition in a split model.

R Shillcock1, P Monaghan

  • 1Department of Psychology and Institute for Adaptive and Neural Computation, Division of Informatics, University of Edinburgh, Scotland, U.K. rcs@cogsci.ed.ac.uk

Neural Computation
|May 22, 2001
PubMed
Summary

Visual word recognition is constrained by how the brain processes visual fields. Our model demonstrates how splitting visual input explains the exterior letters effect in reading.

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Area of Science:

  • Cognitive Neuroscience
  • Computational Neuroscience
  • Psycholinguistics

Background:

  • Visual word recognition models often overlook the constraints imposed by the visual field projection to the cortex.
  • Higher-level cognitive processes in word recognition may not fully overcome initial visual field splitting.

Purpose of the Study:

  • To propose a model of visual word recognition informed by the visual field projection to the cortex.
  • To investigate how the splitting of the visual field and contralateral projection influence word recognition.
  • To explain the 'exterior letters effect' in reading.

Main Methods:

  • Developed a schematic connectionist model of word recognition.
  • Instantiated precise splitting of the visual field and contralateral projection of hemifields within the model.

Related Experiment Videos

  • Analyzed model behavior with words and random patterns.

    • Main Results:

    • The model spontaneously and robustly exhibited correct word recognition behavior.
    • The model's behavior was analyzed concerning its response to words versus random patterns.
    • The systematic division of visual input was identified as the primary driver of the exterior letters effect.

    Conclusions:

    • The projection of the visual field to the cortex is a critical constraint for modeling visual word recognition.
    • The contralateral projection of visual hemifields and visual field splitting are fundamental to word recognition.
    • The proposed model robustly explains the exterior letters effect as a consequence of visual input division.