PSYB65H3 Chapter Notes - Chapter 8: Paraphasia, Agraphia, Cochlea

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18 Dec 2011
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Sounds are vibrations of molecules in the air and a brain is required to hear it. Preferred: between 1000 and 4000 hz wide variety of frequencies. Amplitude loudness: measured in decibels (db, conversational speech: 40-60 db. People with good hearing can detect sounds as quiet as 1 db. Transduction transforming subtle vibrations into neural signals. Hair cells are functionally similar to rods & cones in visual system. 3 anatomical divisions: outer ear, middle ear, and inner ear: outer ear, middle ear. Function to catch and amplify sound waves: chamber between tympanic membrane (ear drum) and the oval window, contents: ear drum, ossicles (3 bones), and the oval window, conversion of sound waves, air pressure = mechanical energy. Propagated and amplified along ossicles to the oval window. Inner ear: mechanical energy = neural activity, cochlea: inner & outer hair cells (within cochlea)

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