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Chapter 9

PSYC 3690 Chapter Notes - Chapter 9: White Noise, Conductive Hearing Loss, Tonotopy

Course Code
PSYC 3690
Heather Jordan

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Auditory nerve
-Threshold turning curve : a graph plotting the threshold of a
neuron or fiber in response to sine waves with varying
frequencies at the lowest intensity that will give rise to a
-Characteristic frequency : the frequency to which an auditory
fiber is most sensitive
-Two tone suppression : a decrease in firing rate of one
auditory nerve fibre due to one tone, when a second tone (of
nearby frequency) is presented at the same time; effects are
more extreme when the suppressor tone has a lower frequency
-Isointensity curve : map of firing rates of an auditory nerve
fiber against varying frequencies at varying intensities
-Rate saturation : the point at which a nerve fiber is firing as
rapidly as possible and further stimulation is incapable of
increasing the firing rate
-Rate-intensity function : a graph plotting the firing rate of
an auditory nerve fiber in response to a sound of constant
frequency at increasing intensities
-Low-spontaneous fiber : <10 spikes per second ; require
relatively internees sounds before firing at a higher rates
-higher-spontaneous fiber : >30 spikes per second; relatively
lower level of sounds to increase firing
- mid-spontaneous fiber
- alternatively; the auditory system can determine frequency by
integrating information across many AN fibres and using the
pattern of firing rate
-Phase locking : firing of a single neuron at one distain point
in the cycle of a sound wave at a given frequency; may occur
because AN fibres fire when the stereocilia move in one
direction but not the other
-Temporal code : turning of different parts of the cochlea to
different frequencies. becomes inconstant for freq > 1000 and
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