section 2 Flashcards
What is neural suppression important for
important for understanding speech in background noise
What is phase locking
synchronization of neural firing with the period of the stimulus waveform
What is a click and what is it used for
click: transient sound (sudden onset, short duration); a broadband stimulus
clicks frequently used to assess a sytem’s frequency response
What is the difference between condensation and rarefaction (what happens when they add)
rarefaction: more tonal output because the filter has thrown out the lower and higher frequencies *earlier response
condensation: shifted 180 degrees, mirror of rarefaction output *later response
they cancel each other out
What does characteristic/best frequency of a neuron determine
time in between peaks
a characteristic frequency greater than the stimulus frequency leads to more time
a characteristic frequency below the stimulus frequency leads to less time
What is two tone rate suppresion?
a second tone added to a first tone results in a reduction of the firing rate of the fiber compared to when it is just the first tone alone
What are the two ways that hearing science test can demonstrate neural suppression for a single neuron
- rate suppression
- two-tone synchrony suppression (a reduced amount of phase locking to a single tone)
What does a neural spectrum show and what is it important for?
represents the firing pattern of the population of fibers
Important for examining the neural response to complex stimuli such as speech
What does the top row, middle row, and bottom row in a neural spectrum show
top row = the sound
middle panels = firing rate
lower panels = synchrony
In one scenarios are formant frequencies preserved (can see formant peaks)
Low level firing rate
low level synchrony
high levels synchrony
When is neural rate saturated?
for moderate and high levels when the population of neural fibers is assessed
spectral peaks are preserved in units with low spontaneous rate
