Exam 6: The Visual System

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A peg-like, cytochrome-oxidase-rich column of dual-opponent color cells is called

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In humans, about __________% of retinal ganglion cell axons become part of the retina-geniculate pathways.

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The Purkinje effect refers to the fact that

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When the pupils are constricted,

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Neurons of the primary visual cortex that have receptive fields that can be divided into static "on" areas and "off" areas separated by straight edges are

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Magnocellular neurons are particularly responsive to

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The parvocellular component of the retina-geniculate-striate system runs through the __________ layers of the lateral geniculate nuclei.

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Parvocellular is to magnocellular as

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The phenomenon of color constancy makes the point that

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The trichromatic theory of color vision is

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Animals without __________ tend to be nocturnal (i.e., active only at night).

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A.T. is a woman with selective damage to her dorsal visual stream. She has

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A nanometer is a

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The first retinal neurons encountered by light entering the eye are the retinal __________ cells.

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Most of the cones are concentrated in the

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Connections between various areas of visual cortex are virtually always

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The receptive fields of complex cortical cells are usually __________ than those of simple cortical cells.

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Somehow the visual system compares the wavelengths of light reflected by adjacent areas of a visual display, and on this basis color is perceived. The cells that appear to perform this function are

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A compelling illustration of contrast enhancement is

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Scotomas are normally identified and characterized by a __________ test.

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