PSYCH 2E03 Lecture Notes - Lecture 16: Microsurgery, Ototoxicity, Neomycin
2 Nov 2016
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Psych 2e03 lecture 16 auditory dysfunction perception. Neural coding of sound frequency place theory. Cochlear nerve simply preserves place coding of frequency sensitivity of basilar membrane. Characteristic frequency: lowest point on tuning curve, frequency at which afferent fibre is most sensitive. Each dip is a neuron"s response to different frequencies. Bottom graph: presenting neuron with different sound intensity: can start to overlay response to neuron of different combinations, progressively greater responsiveness with increasing sound intensity. Neural coding of sound frequency frequency theory. Rutherford thought that auditory fibres responded to frequency by increasing the magnitude of the action potential responses: we know this is wrong because ap"s are all or nothing events. Scientists found action potentials were synced to the wave of the sound stimulus. According to maximum neural discharge rates, true phase-locking can only occur up to. ~400-500hz: but fibres can fire once every few cycles of the wave, dispersed phase locking to 4000hz.
