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Vision.W09 - ELECTROMAGNETIC RADIATION VISION changing...

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ELECTROMAGNETIC RADIATION
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VISION: changing electromagnetic radiation Into neural firing
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Dark current receptors fire in the absence of light
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Receptors located in the retina (the retina is part of the brain) rods: achromatic greater sensitivity c o n e s : color vision greater acuity
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Fovea: central region of retina highest concentration of cones Your concentration of rods is greatest about 17 degrees peripheral to the fovea.
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HOW TO RUIN AN OTHERWISE ROMANTIC MOMENT “The greatest concentration of rods is 17 degrees peripheral to the fovea...”
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Rods and cones Project to Horizontal, Bipolar, and Amacrine cells, Which project to Ganglion cells The ganglion cells Are the front end Of the optic nerve. What happens From there?
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THEORY 1 The optic nerve projects to the lateral geniculate nucleus of the thalamus (LGN), which projects to the visual cortex. There is a point-for-point correspondence between points on the retina and points in visual cortex.
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. . . .
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But wait.. There are studies which don’t fit in well With this theory of vision 1. Schneider (1967) 2. Hubel & Weisel (1963)
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