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Any of the ovoid (egg-shaped) areas in the primary visual cortex (Area V1), about a quarter of a millimetre in diameter and separated by half-millimetre interblobs, containing neurons with double-opponent receptive fields sensitive to light of a specific wavelength (red-green and blue-yellow), and others with ordinary centre-surround receptive fields (white-black), not at all sensitive to shape or movement, responsible for perception of colours including achromatic shades of black, white, and grey. Blobs are found in layers 2 and 3 of the primary visual cortex, receiving projections from sublayers 4Cα and 4Cβ and projecting to Area V2 of the visual cortex, which in turn projects to Area V4 in the fusiform gyrus, an area specialized for colour vision. See also W cell. [So called because it shows up as a blob when the cerebral cortex is stained for the enzyme cytochrome oxidase]

Subjects: Psychology.

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