UM PSYX 250N - PSYX 250N TEST 2 (28 pages)

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PSYX 250N TEST 2



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PSYX 250N TEST 2

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Pages:
28
School:
University of Montana
Course:
Psyx 250n - Fund Biol Psyc

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PSYX 250N Test 2 Vision Part 1 Sensation the transformation of physical stimuli e g light energy mechanical energy environmental chemicals into signaling within the body e g through neuron communication Perception The acquisition of knowledge through sensation Sensory Transduction The process by which energy in the environment is converted into cellular signaling Happens in the eye Sensory Receptor A cell that performs a sensory transduction not to be confused with a protein receptor Photons Units or waves of energy Released when something sun lightbulb expels energy More energy higher wave frequency Always travel at the same speed Most Essential Parts of Eye Pupil Space within the iris that allows light to pass through the lens Lens focuses light Vitreous Humor Fluid inside the eye Retina Layer of Photoreceptors and neurons lining the inner wall of the eye Optic Nerve Bundle of axons carrying signals from the eye to the brain The Retina Route within retina Messages from receptors at the back of the eye Bipolar Cells Ganglion Cells Ganglion Cells axons join together and travel back to the brain Additional Cells called Amacrine cells get information from bipolar cells and send it to other bipolar Amacrine and ganglion cells Amacrine Cells refine the input to ganglion cells allowing them to respond specifically to shapes movements etc Optic Disk Blind Spot Where the axons of the retinal ganglion cells all converge to become the optic nerve Area above the optic nerve where there are NO photoreceptors Most Essential Features of the Retina Fovea Meaning pit dense area of photoreceptors at the center of vision specialized for acute detailed vision 3 Layers of Cells Photoreceptors Rods Not color selective more sensitive to light Not useful in daylight b c bright light bleaches them Outnumber cones 20 1 Cones Color Selective dense at fovea Useful in bright light Provides 90 of the brains input Shape Change intracellular signaling reduced signaling to other cells Bipolar



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