Lecture 4 - Sensory Mechanisms-Updated

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Unformatted text preview: lg.mov 22 Mechanorecep6on and audi6on •  What is loud? –  Sound is characterized by amplitude (loudness) and frequency (pitch) –  Louder sounds produce larger fluid vibra6ons that cause the hair cell stereocilia to bend more, increasing their release of excitatory neurotransmiiers. –  The release of more neurotransmiiers increases the firing rate of the postsynap6c cell. –  The firing rate indicates intensity, or in the case of hearing, loudness. 23 Mechanorecep6on and deafness •  Hearing loss: –  Conduc6on deafness – is caused by a loss of func6on of the tympanic membrane and/or the ossicles •  Scarring and s6ffening of 6ssue produced by ear infec6ons •  Increasing age, the ossicle s6ffens resul6ng in the loss of the ability to hear high frequency sounds –  Nerve deafness – is caused by damage to the inner ear •  Loud music, damage is cumula6ve and irreversible 24 Mechanorecep6on and deafness •  Hearing loss: •  Increasing age, the ossicle s6ffens resul6ng in the loss of the ability to hear high frequency sounds hip://graphics.ny6mes.com/packages/audio/nyregion/20060610_RINGTONE.mp3 hip://www.ny6mes.com/2006/06/12/technology/12ring.html?_r=0 25 Mechanorecep6on and deafness •  Deafness –  Usually damage to hair cells within cochlea...
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