June 2017
Volume 17, Issue 7
Open Access
OSA Fall Vision Meeting Abstract  |   June 2017
Genesis of pattern and contour selectivity by intra-cortical circuits: functional implications of the pinwheel mosaic
Journal of Vision June 2017, Vol.17, 29. doi:10.1167/17.7.29
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      Qasim Zaidi, Erin Koch, Jianzhing Jin, Jose-Manuel Alonso; Genesis of pattern and contour selectivity by intra-cortical circuits: functional implications of the pinwheel mosaic. Journal of Vision 2017;17(7):29. doi: 10.1167/17.7.29.

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

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Abstract

We distinguish shapes by contours, and surfaces by patterns and textures of multiple orientations and scales, despite retinal response compression leading to cross-orientation suppression. In striate cortex of primates and carnivores, orientation preference is arranged as iso-orientation domains that radiate circularly from pinwheel centers. Using tangential penetrations with multi-electrode arrays, we found that orientation tuning is narrower, and contrast saturation and cross-orientation suppression stronger, within iso-orientation domains than at pinwheel centers. These differences develop due to excitation (not normalization) from neighboring oriented neurons. As a result of these local intra-cortical computations, narrower tuning, greater cross-orientation suppression and higher contrast gain of iso-orientation cells, lead to extraction of object contours from images; whereas broader tuning, greater linearity and less suppression of pinwheel cells, generate selectivity for surface patterns and textures.

Meeting abstract presented at the 2016 OSA Fall Vision Meeting

Footnotes
 Supported by NIH grants EY05253, EY07556, EY13312.
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