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 TH, 2015

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

Video Lessons Auditory Structure Auditory Processing How Sound is Transferred to the Inner Ear

Discussion Describe the patterns of complex waveforms that could be heard at: A dance club A sporting event On a beach At a construction site

The Ear

Middle Ear

Cochlea Perilymph ◦A fluid that fills the tympanic and vestibular canals Round Window ◦Relief valve at the base of the tympanic canal

Basilar Membrane

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 outer hair cells ◦Cylindrical ◦Stereocilia attached to tectorial membrane ◦Amplify and sharpen responses of inner hair cells Auditory Nerve Type 1 – 95% - Thick myelinated Type 2 – 5% - Thinner unmylenated

Stereocilia

Neural Representation of Frequency and Amplitude Place code for frequency Temporal code for frequency

Place Code For Frequency

Place Code For Frequency - Evidence

Temporal Code

Amplitude Representation

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

Age related Sensorineural impairments

Effects of Hair Cell Death and Hearing Level

Cochlear Implants

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