Lec14_Audition - Intro to Audition & Hearing Lecture 14...

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Jonathan Pillow Perception (PSY 323) The University of Texas at Austin Lecture 14 Chapter 9
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The Function of Hearing Outline 1. Nature of sound 2. Anatomy and physiology of the auditory system 3. How we perceive loudness and pitch 4. Impairments of hearing
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Part 1: The Physics of Sound
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What is sound? collisions, created when objects vibrate • in a gas (air), it is changes in pressure (compression and rarefaction)
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time 1 time 2 time 3 time 4 Snapshot of the pressure at time 4 These collisions travel as sine waves of pressure .
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Figure 9.1 The pattern of pressure fluctuations of a sound stays the same as the sound wave moves away from the source, but the amount of pressure change decreases with distance
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What Is Sound? Sound waves travel at a particular speed Depends on the medium through air: 340 meters/second through water: 1500 meters/second (vs. 3,000,000 m/s for light!)
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Seeing the pressure waves: sonic boom subsonic sonic http://www.youtube.com/watch?v=-d9A2oq1N38
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Physical qualities of sound waves: Amplitude : the magnitude of displacement of a sound pressure waves related to loudness - the perceived intensity of a sound Frequency : the number of times per second that a pattern of pressure repeats related to pitch - psychological quality of how “high” or “low” a sound is. Psychological properties of sound
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This note was uploaded on 02/08/2011 for the course PSY 332 taught by Professor Salinas during the Spring '07 term at University of Texas at Austin.

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Lec14_Audition - Intro to Audition & Hearing Lecture 14...

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