Download - Fundamentals of Sensation and Perception SOUND AND THE EARS ERIK CHEVRIER OCTOBER 5 TH, 2015
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Fundamentals of Sensation and Perception SOUND AND THE EARS
ERIK CHEVRIER
OCTOBER 5 T H , 2015
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Videos Cymatics Orchestra in my Mouth Unlocking Music With Neuroscience Music on the Brain Transmission of Sound – Animated Video The Human Cochlea – Animated Video Organ of Corti – Animated Auditory Transmission – Animated Video
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Video Lessons Auditory Structure Auditory Processing
How Sound is Transferred to the Inner Ear
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Discussion Describe the patterns of complex waveforms that could be heard at: A dance clubA sporting eventOn a beachAt a construction site
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The Ear
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Middle Ear
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Cochlea Perilymph
◦ A fluid that fills the tympanic and vestibular canals
Round Window◦ Relief valve at the base of the tympanic canal
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Basilar Membrane
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Organ of Corti Each hair cell has about 50 – 150 stereocilia
Inner Hair Cells◦ 3 500 inner hair cells◦ Pear shaped◦ Stereocilia not attached to tectorial membrane◦ Most important for transduction
Outer Hair Cells◦ 3 rows of about 12 000 outer hair cells◦ Cylindrical◦ Stereocilia attached to tectorial membrane◦ Amplify and sharpen responses of inner hair
cells
Auditory NerveType 1 – 95% - Thick myelinatedType 2 – 5% - Thinner unmylenated
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Stereocilia
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Neural Representation of Frequency and Amplitude Place code for frequency Temporal code for frequency
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Place Code For Frequency
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Place Code For Frequency - Evidence
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Place Code For Frequency - Evidence
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Temporal Code
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Amplitude Representation
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Disorders of Audition Tinnitus
◦ A persistent perception of sound (ringing or buzzing) not caused by actual sound.
Conductive Hearing Impairments◦ Loss of sound conduction to the cochlea as a
result of problems in the outer or middle ear
Sensorineural Hearing Impairments◦ Hearing impairments caused by damage to the
cochlea, the auditory nerve, or the auditory pathways of the brain◦ Aging◦ Noise induced
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Age related Sensorineural impairments
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Effects of Hair Cell Death and Hearing Level
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Questions?