![]() Because of properties related to sodium channels on the neuronal membrane that are involved in action potentials, there is a point at which a cell cannot fire any faster (Shamma, 2001).The place theory of pitch perception suggests that different portions of the basilar membrane are sensitive to sounds of different frequencies. While this is a very intuitive explanation, we detect such a broad range of frequencies (20–20,000 Hz) that the frequency of action potentials fired by hair cells cannot account for the entire range. This would mean that a given hair cell would fire action potentials related to the frequency of the sound wave. We’ll discuss two of them here: temporal theory and place theory.The temporal theory of pitch perception asserts that frequency is coded by the activity level of a sensory neuron. But how does the auditory system differentiate among various pitches? Several theories have been proposed to account for pitch perception. Low-frequency sounds are lower pitched, and high-frequency sounds are higher pitched. Pitch Perception We know that different frequencies of sound waves are associated with differences in our perception of the pitch of those sounds.
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