1 - Basics of Sound Processing Flashcards
What happens to an auditory nerve if it continues to be stimulated?
The firing rate drops until the energy output is balanced by the energy input
What happens when an auditory nerve is first stimulated?
It responds vigorously
What do we call it when a drop in sensitivity causes a drop in threshold?
Temporary Threshold Shift
TTS
Temporary Threshold Shift (TTS) is an example of _______.
Neural Adaption
When does fatigue occur?
When sensitivity is reduced and absolute threshold increases
How does fatigue differ in low exposure and high exposure situations?
Low Exposure - Transient
High Exposure - Can be permanent and/or pathological
What is the abnormal growth of perceived loudness that occurs in response to sensation levels?
Loudness Recruitment
When does loudness recruitment usually occur?
In impaired ears but it can occur with normal hearing
What is loudness recruitment associated with?
It is connected to Outer Hair Cell damage
In what conditions is loudness recruitment absent?
Conductive or retroconductive deafness
What happens when there are increases in sound intensity?
Larger areas of the basilar membrane are stimulated
Neurons with high threshold have _____ & _____.
Low spontaneous firing rates
Less sensitive synapses
Neuron saturation = ____________
Fatigue
The dynamic range for neurons with high spontaneous firing rates is __________.
Small
15-30 dB
What is the firing frequency usually?
A logarithmic function of stimulus intensity