Midterm Frequency

Question 1

Frequency

Answer 1

The number of cycles per second

Question 2

Threshold of frequency limits

Answer 2

20-20,000 Hz
Below 20- no tonal qualities
Below 15- get tactile sensation
10- flutter sensation

Question 3

How is the upper limit determined

Answer 3

It is the terminal frequency at which hearing occurs in the absence of pain

Question 4

Electrophysiologic studies

Answer 4

Anesthetized pts, cochlea responds to freq above 20,000

Question 5

Differential sensitivity is determined by

Answer 5

Duration
Interval between stimuli
Psychophysical method used
Frequency
Intensity

Question 6

Measuring differential sensitivity

Answer 6

Differences between tones must be slightly different
Must present to tones in succession
Cannot be presented simultaneously
Abrupt changes are best

Question 7

How do we pick out certain frequencies

Answer 7

Ears act as a series of auditory bandpass filters
When detecting a signal in noise, we use the filter with the center frequency close to the signal, signal is passed but most of the sound is removed
Threshold is determined by the SNR at the filter
As the band with increases, more noise enters the filter to mask the signal

Question 8

Auditory filters estimates performed using two methods

Answer 8

Psychophysical tuning curves- Signal presented at fixed level, masking noise presented
Notched-Noise method- Subject is presented with a notched noise as the masker a sinusoid as the signal