Human Physiology

Human Physiology - AUDITION(reading B&L Chapter 8 pp...

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AUDITION videos: http://www.youtube.com/watch?v=btSrRQAWN6k
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AUDITION (hearing) like vision, information arising at a distance complex CNS anatomy AURUS=EAR (LATIN) OTIKOS=EAR (GREEK) ototoxic- damaging to receptor cells otoscope- device to look in ear otitis media- middle ear infection
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What is the stimulus for sound? Pressure waves, from vibration at a source (compression and rarefaction of air molecules) auditory system described in terms of responses to sine waves time pressure frequency - pitch amplitude - loudness
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AUDIBLE FREQUENCIES: 20-20,000 cps (other species can hear much higher frequencies) sine wave
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audible range 20-20,000 cps BUT not equally sensitive to all frequencies of sound threshold (how loud does sound have to be) vs. frequency
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20-20,000 BUT loss of sensitivity to high frequency sounds with aging (noise-induced damage to receptor cells, hair cells)
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Anti-teenager sound weapon Today's New York Times profiles an invention that emits a high-frequency sound designed to annoy people younger than 20. Apparently, people older than 30 can't hear it. Howard Stapleton of Barry, Wales invented the device, called the Mosquito, to drive away teenagers loitering around storefronts. From the NYT: A trip to Spar here in Barry confirmed the strange truth of the phenomenon. The Mosquito is positioned just outside the door. Although this reporter could not hear anything, being too old, several young people attested to the fact that yes, there was a noise, and yes, it was extremely annoying. "It's loud and squeaky and it just goes through you," said Jodie Evans, 15,
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Human Physiology - AUDITION(reading B&L Chapter 8 pp...

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