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Lecture 11

Unit 2 - Lecture 11 - Auditory System Textbook Notes.docx

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PSYO 1011

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PSYO 1011 Auditory System Supplementary Notes 1 Lecture 11: Auditory System October 20, 2009 Audition: • Sound waves o Stimuli for hearing o Pressure waves in air o 2 Characteristics  Frequency, Amplitude • Frequency o 1 Hz = 1 cycle/second o Related to pitch  Higher pitch = higher frequency o Humans detect 20 – 20 000 Hz • Amplitude o Vertical size of sound waves  Amount of compression & expansion of molecules o Primary determinant of loudness  Measured in dB  Anatomy of the Ear: • Sound waves travel into auditory canal • Auditory canal leads to eardrum o Eardrum is a movable membrane that vibrates in response to sound waves • Behind ear drum is the middle ear o Vibration of 3 bones in the middle ear amplifies sound waves o Bones of the middle ear  Hammer (malleus)  Anvil (incus)  Stirrup (stapes) • Oval window forms boundary between middle & inner ear • Inner Ear o Cochlea is filled with fluid & contains the basilar membrane o Resting on basilar membrane is the organ of Corti o Organ of Corti contains thousands of tiny hair cells that are sound receptors PSYO 1011 Auditory System Supplementary Notes 2 • Hair cells synapse with neurons of the auditory nerve • Auditory nerve sends impulses via thalamus to the auditory cortex The Ear Inner Ear Auditory Transduction: Pressure Waves to Nerve Impulses • Sound waves strike the ear drum PSYO 1011 Auditory System Supplementary Notes 3 • Pressure created at oval window by hammer, anvil & stirrup  o Sets fluid inside t
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