November 2002
Volume 2, Issue 7
Free
Vision Sciences Society Annual Meeting Abstract  |   November 2002
Conscious selection of bi-stable 3D percepts described by neural population codes
Author Affiliations
  • Raymond Ee
    Helmholtz Institute, Utrecht University, The Netherlands
Journal of Vision November 2002, Vol.2, 459. doi:10.1167/2.7.459
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      Raymond Ee, Casper J. Erkelens; Conscious selection of bi-stable 3D percepts described by neural population codes. Journal of Vision 2002;2(7):459. doi: 10.1167/2.7.459.

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      © ARVO (1962-2015); The Authors (2016-present)

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Abstract

Understanding conscious visual perception is one of the main challenges in vision science. Here we developed both an experimental paradigm and a model to study conscious selection of bi-stable percepts in stereoscopic vision. The paradigm exploits a visual stimulus in which we independently manipulated two signals that our brain uses to retrieve the 3D layout of a scene. One of the signals is binocular disparity (i.e. according to the geometry of vision with two frontal eyes), the other is monocular perspective. The stimulus consisted of a slanted planar grid. When the slants specified by disparity and perspective had the same polarity subjects perceived one single grid, the perceived slant being a reconciliation of disparity-specified and perspective-specified slant. But when disparity- and perspective-specified slants had opposite polarities subjects perceived either a disparity-dominated or a perspective-dominated 3D representation of the slanted grid. A novel feature of the paradigm is that our observers were able to attentively select one of the two alternative percepts at will in a well-controlled way. Our paradigm provides, therefore, not only a promising tool to study conscious vision psychophysically but also to study it physiologically through either neurophysiology or fMRI. The experimental data were well described by a neural-population-code model in which perceived slant is determined by the combined activity of three neural populations (representing disparity, perspective and residual slant signals, respectively).

van  Ee, R., Erkelens, C. J.(2002). Conscious selection of bi-stable 3D percepts described by neural population codes [Abstract]. Journal of Vision, 2( 7): 459, 459a, http://journalofvision.org/2/7/459/, doi:10.1167/2.7.459. [CrossRef]
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