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class+5+lecture_posted - Sensation and Perception Class V:...

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Sensation and Perception Class V: Visual Processing
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Figure 2.7 Photomicrograph of the retina
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Retinal Information Processing Light passes through several layers of cells before reaching the rods and cones The Vertical Pathway: photoreceptor to bipolar to ganglion cell Light activates a photoreceptor, which then signals the horizontal and bipolar cells that synapse with it Bipolar cells are connected to amacrine cells and ganglion cells Ganglion cells have axons that leave the retina through the optic disc (blind spot)
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Retinal Information Processing Various regions of the retina interact via lateral connections Horizontal cells: These cells are responsible for lateral inhibition, which creates the center–surround receptive field structure Amacrine cells: These cells synapse horizontally between bipolar cells and retinal ganglion cells
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Retinal Information Processing P ganglion cells : “Small cells.” Connect to the parvocellular pathway Parvocellular pathway is involved in fine visual acuity, color, and shape processing. They have poor temporal resolution but good spatial resolution M ganglion cells : “Large cells.” Connect to the magnocellular pathway Magnocellular pathway is involved in motion processing. They have excellent temporal resolution but poor spatial resolution
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Lateral Inhibition
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Lateral Inhibition
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Retinal Information Processing Receptive field : The region in space in which stimuli will activate a neuron
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Retinal Information Processing Kuffler mapped out the receptive fields of individual retinal ganglion cells in the cat ON-center ganglion cells These cells are excited by light that falls on their center and inhibited by light that falls in their surround OFF-center ganglion cells The cells are inhibited when light falls in their center and excited when light falls in their surround
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Mach Bands
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Mach Bands
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Hermann Grid
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Hermann Grid
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Hermann Grid
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Hermann Grid
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The actual circuitry of the retina is far more complex than you will learn in this class, for example… At DAYLIGHT levels, the cones send graded signals to their corresponding cone-bipolar cells and rods don’t respond. At TWILIGHT levels, the cones don’t respond, and the rods send
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This note was uploaded on 11/17/2011 for the course PSYCHOLOGY 830:301 taught by Professor Staff during the Spring '10 term at Rutgers.

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class+5+lecture_posted - Sensation and Perception Class V:...

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