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A psychophysical approach to the mechanism of human stereovision

  • Artificial Intelligence and Cognitive Neuroscience
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Foundations and Tools for Neural Modeling (IWANN 1999)

Part of the book series: Lecture Notes in Computer Science ((LNCS,volume 1606))

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Abstract

Binocular complex cells in primary visual cortex encode disparity based on their spatio-temporal receptive field structure. A probabilistic neural network model based on pre-tuned estimators is proposed as general mechanism of stereovision in VI. Temporal and spatial features of stereopsis were studied with single image random dot stereograms (SIRDS). Results: Discrimination threshold of two transparent surfaces in a stereogram depends on disparity of each surface as well as the spatial frequency content. Repeated brief exposures (13.4ms) to stereogram against noise or another stereogram do not disturb stereopsis, even when mask intervals are 53ms (P<0.01). With repeated exposures to longer duration (53ms), subjects performed better than expected by temporal averaging (P<0.01). New findings are discussed on the framework of the model. It was concluded that 1. Disparity estimators are arranged in layers according to their preferred spectral and disparity-selectivity, and 2. Stereopsis has two temporal steps: first local estimates are detected (local stereopsis), and then coherence between different disparity estimators is detected (global stereopsis).

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Authors and Affiliations

  1. Institute for Studies in Theoretical Physics and Mathematics, Tehran, Iran

    Farshad Moradi

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  1. Farshad Moradi
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José Mira Juan V. Sánchez-Andrés

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© 1999 Springer-Verlag Berlin Heidelberg

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Moradi, F. (1999). A psychophysical approach to the mechanism of human stereovision. In: Mira, J., Sánchez-Andrés, J.V. (eds) Foundations and Tools for Neural Modeling. IWANN 1999. Lecture Notes in Computer Science, vol 1606. Springer, Berlin, Heidelberg. https://doi.org/10.1007/BFb0098236

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  • DOI: https://doi.org/10.1007/BFb0098236

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  • Publisher Name: Springer, Berlin, Heidelberg

  • Print ISBN: 978-3-540-66069-9

  • Online ISBN: 978-3-540-48771-5

  • eBook Packages: Springer Book Archive

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