Airborne vs. bone conduction. Conduction hearing loss.

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Presentation transcript:

Airborne vs. bone conduction

Conduction hearing loss

Sensorineural hearing loss

The three parts of the ear

Sound frequency ≈ pitch

Sound amplitude ≈ loudness

Phase

Middle ear ossicles

Amplification due to surface area ~16 times

Amplification due to lever action Total amplification =(sa reduction)*(lever) Total amplification =16*1.3 times

Middle ear muscles reduce pressure tensor tympani: lower amplitude, higher f stapedius: lower amplitude

The simplified (unrolled) cochlea

Cochlear tonotopy

Pressure waves and the cochlear duct

Organ of Corti

Outer and inner hair cells

Outer hair cells move

OHCs are the cochlear amplifier

Hair cell and afferent neuron responses to sound

Hearing depends on extensive central processing

Speech production

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