6 Psych 15 Sensation - The Visual System I The Eye Detects...

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The Visual System I. The Eye Detects Electromagnetic Energy A. The visible light spectrum (ranges 380 - 760 nm for the human eye) 400 500 600 700 Wavelength (nm)
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B. The structure of the eye 1. RETINA 2. FOVEA 3. BLIND SPOT 4. OPTIC NERVE
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C. The cells of the RETINA 1. RODS -- scotopic vision; CONES -- photopic vision 2. BIPOLAR and GANGLION cells-- retinotopic map 3. AMACRINE and HORIZONTAL cells--lateral processing
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D. Photochemical transduction IN THE DARK 1. Rods are continuously depolarized. 2. Glutamate release occurs spontaneously. IN THE LIGHT 1. Light bleaches rhodopsin. 2. cGMP is broken down and sodium channels close. 3. Rods are hyperpolarized. 4. Glutamate release is inhibited.
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II. Visual Pathways A. Primary visual pathways--ganglion cells in retina-- lateral geniculate nucleus (LGN)--primary visual cortex 1. magnocellular pathway-- ventral LGN--fast response-- response to moving stimuli 2. parvocellular pathway--dorsal LGN--slow response--response to color
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B. Secondary visual pathway the retina also projects to the superior colliculus 1. mediates tracking movements 2. mediates saccades (brief eye movements)
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III. Connections in the Visual Cortex A. Primary visual cortex ( V1, striate )
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