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Title page for ETD etd-09062007-082426


Type of Document Master's Thesis
Author Hui, Min
Author's Email Address min.hui@vanderbilt.edu
URN etd-09062007-082426
Title Illusory contour processing in early visual areas: a modeling approach
Degree Master of Arts
Department Psychology
Advisory Committee
Advisor Name Title
Anna W. roe Committee Chair
Thomas J. Palmeri Committee Member
Keywords
  • synaptic modification
  • horizontal connection
  • real-illusory interaction
  • feedback
  • contour integration
  • Neurophysiology -- Mathematical models
  • Optical illusions
  • computational model
  • spatial weighting function
Date of Defense 2007-10-01
Availability unrestricted
Abstract
In this thesis, a computational model for illusory contour processing in early visual areas is proposed. In the model, image features are first measured in model V1. Then the resulting activities in V1 are fed into V2 cells with non-classical bipole property, which was modeled as the result of activity-dependent synaptic modification. The integrated illusory contour information in model V2 is then delivered to model V1 through excitatory feedback connections. A mechanism of unbalanced feedback synaptic weights to orthogonal domains was proposed to explain both V1 orientation reversal pattern in illusory context and excitatory feedback effects from V2 to V1 in real context. This context-dependent activation pattern in V1 and V2 might be the basis of illusory contour perception. Simulation of the model was provided and the result was consistent with existing physiological and psychophysical data.
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