Auditory Paper

Auditory Paper - Peter Rehder 714874731 Psych 220 sec. 001...

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Peter Rehder 714874731 Psych 220 sec. 001 Auditory Paper There are two theories of pitch, place theory and frequency theory. These two mechanisms are combined to explain how humans detect varying pitch. Place theory states that different areas along the basilar membrane react to various sound frequencies. According to the theory, a frequency activates the hair cells of only one area of the basilar membrane and the nervous system determines what frequency is being detected by which neurons are firing action potentials. However, various parts of the basilar membrane are bound together too tightly for a single part to correspond only to one frequency. According to frequency theory, the basilar membrane vibrates in synchrony with a sound frequency, causing neurons to produce action potentials at that frequency. Consequently, a sound at 20Hz would cause 20 action potentials per second in a neuron. The problem with this theory is the refractory period of neurons, which is typically 1/1000 of a second. This means that the
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This note was uploaded on 10/07/2011 for the course PSYCH 220 taught by Professor Loeb during the Fall '10 term at UNC.

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