Lecture 10 - The Auditory System.docx - Jessica Weissman BCS 110 Lecture 10 – The Auditory System Function of the Auditory System The function of the

Lecture 10 - The Auditory System.docx - Jessica Weissman...

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Jessica Weissman BCS 110 Lecture 10 – The Auditory System Function of the Auditory System The function of the auditory system is to perceive sounds (i.e., to localize and to identify sounds in space) What is out there and where is it Physical dimensions of sound relate to perceptual dimensions. A larger pressure wave correlates to the loudness The frequency of waves is related to the pitch of the sound Natural Sounds are Complex Natural sounds are complex patterns of vibrations Fourier analysis breaks a natural sound down into its component sine waves. Completed automatically by your basilar membrane The number of peaks you have in a certain period of time is telling you about the structure of the sound Pitch is the difference in frequency harmonics Identified by the GCF of the recorded harmonics There is a complex relationship between sound components and perception.
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The Ear Sound propagation: Wave enters auditory canal Outer ear collects, middle ear amplifies sound, inner ear is filled with fluid Strikes the eardrum (or tympanic membrane) Ossicles (hammer, anvil, and stirrup) vibrate Oval window vibrates Fluid in cochlea set in motion Vibrations of fluid dissipated at round window The Cochlea The cochlea is divided into three chambers (scala) by Reissner’s membrane and the basilar membrane.
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  • Spring '08
  • Holtzman
  • primary auditory cortex, basilar membrane,  Wave

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