week_7_auditory_1_3 - How Do We Communicate? 1 Auditory...

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Temple, 2005 1 How Do We Communicate? – 1 Auditory System Week 7 Temple, 2005 2 Auditory System • The stimulus: Sound • The organ: Ear • The Receptor: Hair Cell • Balance – (Chapter 10) • Auditory Pathways: Ear to Brain • Auditory Circuits – Pitch – Loudness – Location Temple, 2005 3 The Stimulus: Sound • Sound – Exists as a wave • Wave of pressure changes in air
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Temple, 2005 4 Sound Temple, 2005 5 Frequency Ranges Temple, 2005 6 Amplitude Ranges
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Temple, 2005 7 Complexity Temple, 2005 8 Auditory System • The stimulus: Sound • The organ: Ear • The Receptor: Hair Cell • Balance – (Chapter 10) • Auditory Pathways: Ear to Brain • Auditory Circuits – Pitch – Loudness – Location Temple, 2005 9 Sound Perception • Auditory system’s job – Sound waves create air-pressure changes – Convert air-pressure changes into neural activity • We can detect displacement of air molecules of about 10 picometers (10 -11 meters) – Brain interprets that neural activity as sound
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Temple, 2005 10 The Ear •E a r – Collects sound waves – Transforms displacement of air molecules into displacement of membrane – 3 parts • Outer – Gathers sound • Middle – Air pressure changed to mechanical energy • Inner – Mechanical energy changed to neural activity Temple, 2005 11 Ear Temple, 2005 12 Ear • Sound waves are collected by outer ear • Cause eardrum in middle ear to vibrate – This vibration causes special bones to move – Transform air pressure changes into mechanical changes
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13 Inner Ear Vibration of oval window causes vibrations in cochlea This causes membranes in inner ear to bend (Basilar and tectorial)
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This note was uploaded on 09/28/2008 for the course HD 220 taught by Professor Anon during the Fall '06 term at Cornell University (Engineering School).

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week_7_auditory_1_3 - How Do We Communicate? 1 Auditory...

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