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While the primary visual cortex (V1) was the first visual field map discovered, over the last 15 years, a variety of retinotopic maps have been identified on the ventral and dorsal surface of visual cortex. While definitions of these visual areas will not be discussed, more information about these retinotopic maps can be found [http://white.stanford.edu/~brian/papers/mri/2007-Wandell-VFMReview-Neuron.pdf here]. Information about defining these regions can be found [http://white.stanford.edu/newlm/index.php/Retinotopy_Tutorial#Select_Visual_Field_Map_ROIs here] and [http://vpnl/internal/wiki/index.php/Retinotopy_for_Idiots here]. | While the primary visual cortex (V1) was the first visual field map discovered, over the last 15 years, a variety of retinotopic maps have been identified on the ventral and dorsal surface of visual cortex. While definitions of these visual areas will not be discussed, more information about these retinotopic maps can be found [http://white.stanford.edu/~brian/papers/mri/2007-Wandell-VFMReview-Neuron.pdf here]. Information about defining these regions can be found [http://white.stanford.edu/newlm/index.php/Retinotopy_Tutorial#Select_Visual_Field_Map_ROIs here] and [http://vpnl/internal/wiki/index.php/Retinotopy_for_Idiots here]. | ||
==Traveling wave model== | |||
Revision as of 05:19, 14 March 2012
Introduction to retinotopy
Early visual areas, located in the posterior occipital lobe, are retinotopically organized: A particular location in the early visual cortex responds to stimulation at a particular location in the visual field, while neighboring locations on the cortical surface respond to neighboring locations in the visual field. This pattern of response maps a representation of the visual field onto the cortical surface.
These early visual areas are mapped with two parameters: eccentricity and polar angle. Eccentricity indicates distance from fovea. The most posterior regions of the early visual areas has a pronounced foveal preference, while more anterior regions prefer more eccentric stimuli. In visualizations of retinotopy, eccentricity mapping appears as concentric "rings" of different colors, each denoting a different eccentricity. Polar angle indicates the angle from the horizontal meridian, so polar angle mapping shows the reversals in angular representations on the cortex, which are used in defining retinotopic maps.
While the primary visual cortex (V1) was the first visual field map discovered, over the last 15 years, a variety of retinotopic maps have been identified on the ventral and dorsal surface of visual cortex. While definitions of these visual areas will not be discussed, more information about these retinotopic maps can be found here. Information about defining these regions can be found here and here.