June 2013
Volume 54, Issue 15
ARVO Annual Meeting Abstract  |   June 2013
Mechanisms underlying global stereopsis in fovea and periphery
Author Affiliations & Notes
  • Robert Hess
    Ophthalmology, McGill University, Montreal, QC, Canada
  • Nirel Witz
    Ophthalmology, McGill University, Montreal, QC, Canada
  • Footnotes
    Commercial Relationships Robert Hess, None; Nirel Witz, None
  • Footnotes
    Support None
Investigative Ophthalmology & Visual Science June 2013, Vol.54, 2658. doi:
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      Robert Hess, Nirel Witz; Mechanisms underlying global stereopsis in fovea and periphery. Invest. Ophthalmol. Vis. Sci. 2013;54(15):2658.

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

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Purpose: To better understand the mechanisms underlying global stereopsis we examined the relationship between carrier luminance spatial frequency and modulator disparity spatial frequency.

Methods: Thresholds for detecting global sinusoidal disparity corrugations of equi-detectable spatially band-pass noise were measured as a function of modulator disparity spatial frequency for both centrally and peripherally located stimuli using a standard 2-IFC task.

Results: We found a characteristic relationship that depended on modulator disparity spatial frequency. At high modulator disparity spatial frequencies (>1 c/d), there is an optimal ratio of around 2.6, whereas at low modulator disparity spatial frequencies, there is an optimal absolute carrier luminance spatial frequency (i.e., 3 c/d). In the periphery, vision is restricted to modulator disparity spatial frequencies below 1 c/d and, as a consequence, follows the above rule, there is an optimum absolute carrier luminance spatial frequency that reduces in spatial frequency with increasing eccentricity.

Conclusions: This finding is consistent with there being more than one channel processing global stereo. This is subsequently confirmed using a 2x2 AFC detection/discrimination paradigm. Furthermore, because of the different carrier/modulator relationships in central and peripheral vision, peripheral global stereo cannot be simply related to central global stereo by a scaling factor and thus cannot be simply due to cortical magnification as previously proposed.

Keywords: 434 binocular vision/stereopsis • 640 pattern vision  

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