sensation and perception

sensation and perception - SensationandPerception 17:57

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Sensation and Perception 17:57 Sensation is a a molecule being detected by a cutaneous (touch) receptor Touch is interpretation Sensation is objective biological processes that environmental stimuli evoke Perception is subjective experience/interpretation of sensations Vision Stimulus Electromagnetic radiation (light) Can act as particle or wave Color spectrum (400-700nm is visible) Color is our perception of the stimulus Length of wave is measured peak-to-peak Inverse relationship to frequency Amplitude of peaks determines brightness Purity = saturation Amount of different wavelengths coming at you The more different colors, the whiter the light Increased purity (smaller range of waveforms), the most saturated and vivid the picture  looks Anatomy of the Eye Cornea
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Protection Bending light to back of eye Pupil (hole) Made by iris (colored muscle) that expands and constricts Lens Bends the light in order to focus it to the back of the eye Near sighted or far sighted if lens is not bent properly Eye filled with jelly-like fluid Retina Membrane behind eye Several layers of neurons (piece of brain) Anatomy First layers=photoreceptors (in back and most sensitive) Cones  Photopic/greater visual acuity Less than rods More in center of retina Details Rods (scotopic) Differences in amount of color (lines)0 More than cones
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Peripheral to fovea Transduction (changing stimulus into neuro signal) Adaptation to darkness Cones very quickly adapt to dark but not well Rods take some time, but adapt more thoroughly  Bipolar cells Ganglion cells Ganglion axons Exit through optic disc into brain Visual pathway Ganglion cells   bipolar cells = rods and cones No photoreceptors on optic disk Blind spots Not in exact spot in each eye Completion Brain taking information Contralateral connection (eyeball connected to opposite side of brain
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This note was uploaded on 02/22/2012 for the course PSYC 101 taught by Professor Loeb during the Fall '08 term at UNC.

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sensation and perception - SensationandPerception 17:57

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