SHS 311 Test Questions with 100% Correct
Answers
Both MAF and MAP have 2 steps:
1. Calibration
2. Measurement
How do threshold of hearing change with duration of a sound?
Our auditory system is a constant energy detector, so energy = power x duration. Therefore
energy in dB = power dB + 10 log duration. When duration is doubled (10logduration) would
increase by 3 dB. So the power should decrease by 3 dB to maintain a constant energy for
sound detection. When duration is double the sound detection threshold in power needs to
decrease by 3 dB
How is the psychophysical tuning curve measured? Understand the relationship with
the internal auditory filter. How does it avoid the beats and non linear distortion
between masker and signal?
To get the psychophysical tuning curve, you will use a short duration and low level signal
and measure the masker level required for different masker level frequencies to barely mask
the signal
Lets say in an MAF procedure, A calibration of 0.1 volt to a loud speaker generated
sound pressure of 100 micropascals. During the measurement a 1V in the loud speaker
would generate lowest sound level to be detected.. What is the sound detection threshold
in micropascals?
To solve this problem, For the linear presentation system the ratio of output sound pressure --
> ? micropascals/100 micropascals. the pressure during measurement / pressure during
, calibration = 1 volt/ 0.1v 100 micropascals x * 1v/0.1v= 1000 micropascals. Review
homework/
MAF procedure of hearing threshold measurement
Minimam audible field procedure that uses a loud speaker to measure sound detection
threshold in a free field
MAP procedure
The MAP is the minimal audible pressure procedure that uses headphone to present sound
and measure the sound detection threshold within the ear canal close to the eardrum.
To adress the limitations of method of constant stimulu, what new measure adressess
response bias
Theory of signal detection
What are the acoustic cues used for sound segregation and grouping?
Sound segregation: Spatial, spectural, and temporal seperation
sound grouping: harmonic relationship, temporal continutity, temporal modulations
intensity cues are not useful for sound segregation or sound grouping.
What are the two neural mechanisms that may be used to determine the pitch of a pure
tone? In what frequency ranges do they work (low or high frequencies?)
insert photo Nueral activation pattern
1. Place cues (which group of neurons would fire in response to the input sound).. the
Answers
Both MAF and MAP have 2 steps:
1. Calibration
2. Measurement
How do threshold of hearing change with duration of a sound?
Our auditory system is a constant energy detector, so energy = power x duration. Therefore
energy in dB = power dB + 10 log duration. When duration is doubled (10logduration) would
increase by 3 dB. So the power should decrease by 3 dB to maintain a constant energy for
sound detection. When duration is double the sound detection threshold in power needs to
decrease by 3 dB
How is the psychophysical tuning curve measured? Understand the relationship with
the internal auditory filter. How does it avoid the beats and non linear distortion
between masker and signal?
To get the psychophysical tuning curve, you will use a short duration and low level signal
and measure the masker level required for different masker level frequencies to barely mask
the signal
Lets say in an MAF procedure, A calibration of 0.1 volt to a loud speaker generated
sound pressure of 100 micropascals. During the measurement a 1V in the loud speaker
would generate lowest sound level to be detected.. What is the sound detection threshold
in micropascals?
To solve this problem, For the linear presentation system the ratio of output sound pressure --
> ? micropascals/100 micropascals. the pressure during measurement / pressure during
, calibration = 1 volt/ 0.1v 100 micropascals x * 1v/0.1v= 1000 micropascals. Review
homework/
MAF procedure of hearing threshold measurement
Minimam audible field procedure that uses a loud speaker to measure sound detection
threshold in a free field
MAP procedure
The MAP is the minimal audible pressure procedure that uses headphone to present sound
and measure the sound detection threshold within the ear canal close to the eardrum.
To adress the limitations of method of constant stimulu, what new measure adressess
response bias
Theory of signal detection
What are the acoustic cues used for sound segregation and grouping?
Sound segregation: Spatial, spectural, and temporal seperation
sound grouping: harmonic relationship, temporal continutity, temporal modulations
intensity cues are not useful for sound segregation or sound grouping.
What are the two neural mechanisms that may be used to determine the pitch of a pure
tone? In what frequency ranges do they work (low or high frequencies?)
insert photo Nueral activation pattern
1. Place cues (which group of neurons would fire in response to the input sound).. the
