Ch7 - The Auditory System Ch 7 What you should know about...

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The Auditory System Ch. 7
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What you should know about Audition 1) How sound is created and the physical properties of sound 2) The main auditory pathway and connections 3) Anatomy of the ear, cochlea, and organ of corti 4) How transduction of sound occurs 5) Disorders of the auditory system
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The Stimulus: Sound Sound is produced by objects that vibrate and set molecules of air into motion. These vibrations of air are perceived as sound. • Sound travels approximately 700 miles/hour • Humans are sensitive to vibrations between 30 and 20,000 times/second
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Sound Waves Fig. 7.1 Object that is vibrating
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Physical Dimensions of Sound Pitch A perceptual dimension of sound and corresponds to the fundamental frequency (cycles/second = Hertz {Hz}) Loudness A perceptual dimension of sound and corresponds to intensity (amplitude of waveforms) Timbre A perceptual dimension of sound and corresponds to complexity loud soft high low simple complex Fig. 7.2 Peak = higher Peak = shorter 3 cycles per sec 1 cycle per sec
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The Outer Ear Pinna Ear Canal Tympanic Membrane Fig. 7.3
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The Middle Ear Ossicles Eustachian tube Fig. 7.3 Malleus: hammer Incus: anvil Stapes: stirrup
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The Inner Ear cochlea Oval Window (underneath Stapes) Round Window Auditory nerve Fig. 7.3 Vestibule
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Ch7 - The Auditory System Ch 7 What you should know about...

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