The Human Ear Hearing, Sound Intensity and Loudness Levels
to sound waves in the perilymph fluid. The bending of the stereocilia stimulates the hair cells, which in turn excite neurons in the auditory nerve. The neuron firing/impulse rate on the auditory nerve depends on both the sound intensity I and the frequency f of the sound – e.g. neurons do not fire on every oscillation cycle of frequency
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