Retinotopy is the concept that certain areas of the visual cortex are organized in a way that adjacent points in the visual field (that fall on adjacent points on the retina) are processed by neurons in adjacent parts of that cortical area. As a direct consequence, the receptive fields of neighboring neurons are next to each other (or even overlap) in the visual field. A cortical area is a spatially confined unit of the cerebral cortex. ... The visual cortex is the general term applied to both the primary visual cortex (also known as V1) and the visual association area (V2, V3, V4, V5). ... Your field of view is that part of the observable world that you are able to see at any given moment. ... Human eye cross-sectional view. ... Receptive fields are areas of the retina, producing a change in the firing of cells in the visual system. ...
Those visual areas of the cortex that perform the first steps of processing the retinal image tend to be organized retinotopically, while this is less the case for higher processing steps such as the identification of faces.
ABSTRACT Previous studies of cortical retinotopy focused on influences from the contralateral visual field, because ascending inputs to cortex are known to be crossed.
Contralateral Retinotopy of “Ipsilateral” Stimuli In the contralateral (control) hemisphere, these stimuli produced a pattern of activation predictable from the shape of the stimulus relative to previously described retinotopic maps in areas V1, V2, V3, VP, V3A, and V4v.
Regions showing significant contralateral retinotopy with polarity similar to that in the visual field are shown in yellow, and regions showing significant mirror-symmetric contralateral retinotopy are shown in blue.
Detailed retinotopy of the polar angle representation, from the same hemisphere shown in Fig.
This contrasts significantly with the three extrastriate representations posterior to V8 (V4v, VP, and the inferior wing of V2), all of which are quarter-field representations of the contralateral upper visual field.
Although the polar-angle retinotopy in V8 includes an additional representation of this quarter field, it also extends further to include a lower-field representation as well (Figs 2 and 3).
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