PSYO 2470 Lecture Notes - Lecture 4: Hearing Loss, Vestibulocochlear Nerve, Tonotopy
26 Jan 2018
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*hearing is our second most sensitive sense: allow us to communicate, detect danger and it also give us pleasure. Auditory receptors in cochlea (changes of pressure) > brain stem neurons > mgn (in the thalamus) > auditory cortex (temporal lobe). Auditory canal > tympanic membrane > ossicles (3 bones) > oval window > cochlea > auditory vestibular nerve. (this is how sound travel through the ear). The ossicles work by: increasing force (a bit) by lever mechanism, delivering force to smaller surface area. *3important structures: tectorial membrane, organ of corti. (outer and inner hair cells connected to the sterocillia, basilar membrane. (with sound the basilar membrane is deflected up; it vents) *hair cells are interconnected with structures called tip link which allows k+ in for activation. Sound localization: duplex theory: intensity (sound shadow) and time delay (not all sounds reaches both ears at the same time); these two factors allow us to identify location of sounds.
