PSY100H1 Chapter Notes - Chapter 4.3: Basilar Membrane, Sound, Hair Cell
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PSY100H1 Full Course Notes
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Document Summary
Sound: sound waves: changes in mechanical pressure transmitted through solids, liquids, or gases, frequency: wavelength (hz) & determines pitch, pitch: perceptual experience of sound wave frequencies. High pitch = small wavelength: amplitude: loudness (db- decibels) Pinna: flexible outer flap of the ear (ear shell) Channel sound waves into the ear & determine source of sound. Eardrum: soundwaves vibrate the eardrum passes the vibration down: middle. Ossicles: 3 tiny moveable bones (hammer, anvil, stirrup) Eardrum is attached- sound vibrations from the eardrum vibrate: inner the ossicles. Cochlea: fluid-filled membrane coiled into snail-like shape. Basilar membrane (hair-like projections) soundwaves vibrate the eardrum ossicles vibrate ossicles"s vibration causes basilar membrane to flex flexing causes fluid inside cochlea to move movement displaces tiny hair cells hair cell movement stimulates cells stimulate auditory nerves. Sound localization: identifying where sound comes from: brain stem & inferior colliculus (midbrain)
