lecture_11_13

lecture_11_13 - Encoding of frequency in the brain stem DCN...

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Encoding of frequency in the brain stem DCN Temporal following of frequency is maintained in SOME low frequency (< ~ 3 kHz) neurons in the brain stem. Tonotopy is maintained in the auditory nerve and cochlear nucleus (CN) by reserving the anatomical relationships in cochlea aud. nerve AVCN preserving the anatomical relationships in projections. A schematic example is shown in the t f t h A V C N L h tonotopy of the AVCN o w i g PVCN h Brain Stem
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However beyond the CN some areas preserve tonotopy and some don’t ther Not Tonotopic MGBm Other cortex For example, in thalamus auditory cortex, some areas (like the primary auditory rtex, A1, anmd MGBv) are tonotopic IC MGBv GBd A1 cortex, A1, anmd MGBv) are tonotopic while other areas are not (MGBm MGBd Other cortex onotopic Tonotopic
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Encoding Frequency in the peripheral auditory system Hair cells located in different places on the basilar membrane respond to different frequencies (pitches) of sound. Their responses to stimuli can X.A.2 Encoding sound frequency be plotted as frequency tuning curves (FTC’s) Frequency tuning curves (FTCs) represent the frequency/intensity receptive field of auditory neurons. BW The cell is most sensitive to the “best” or “characteristic” y (dB) m threshold this axis At higher intensities, the neuron with the FTC to the left responds to a wider range of frequencies (or frequency (CF) which is the lowest point on the FTC. Intensit y book uses the ter m y threshold) on t larger bandwidth) than at lower intensities. Frequency (kHz)
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This note was uploaded on 11/22/2009 for the course NPB 100 taught by Professor Chapman during the Fall '08 term at UC Davis.

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lecture_11_13 - Encoding of frequency in the brain stem DCN...

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