vision3_15_10bb

vision3_15_10bb - Fovea • 3 pigments Transduction •...

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Fun with vision or lies my brain tells me!
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Vision Form, Color, Location, Movement and Identity of objects EYE BRAIN Retina Photoreceptors Visual cortex
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Vision Visual field Area you can see without moving your head or eyes
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Vision Visual field Area you can see without moving your head or eyes Acuity Sharpness Photoreceptors Rods and Cones Rhodopsin
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Vision Refraction Bending of light, forms image Cornea & Lens Retina
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Visual system Light Specific range Visible light Photons
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Transduction Retina Photoreceptors Rods Cones Horizontal cells Bipolar cells Amacrine cells Ganglion cells AP Optic Nerve
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Processing Rods (Scotopic) Dim light >100 million Night vision Rhodopsin Cones (Photopic) Bright light Color vision
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Unformatted text preview: Fovea • 3 pigments Transduction • Tonically active • Rhodopsin – Retinal and Opsin – Light Rhodopsin = Opsin – HYPERpolarization of rod or cone – Reduction in neurotransmitter release • Glutamate Retinal processing: Seeing edges What do you see at the left? What do you perceive? Now what? Why? Retinal Processing • Tonic activity • Bipolar cells – Depolarized or Hyperpolarized • Off-Center – Turning off light in center excites (more glutamate) • On Center – Less glutamate (normally inhibitory) • Ganglion Cells – Off Center & On Center Retinal processing: Seeing edges What do you see at the left? What do you perceive? Now what? Why? Lateral inhibition...
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This note was uploaded on 02/24/2011 for the course PSYC 460 taught by Professor Lawrence during the Spring '10 term at South Carolina.

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vision3_15_10bb - Fovea • 3 pigments Transduction •...

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