SPAU 3304 Test 3 UPDATED ACTUAL
Exam Questions and CORRECT Answers
How do the two ears relate to sound localization? - CORRECT ANSWER - -1 ear is
needed to process frequency and intensity
-2 ears are needed to locate sound
What are the cues of localization? - CORRECT ANSWER - -Temporal (time): phase
-Level (intensity)
What is localization? - CORRECT ANSWER - Localization is the process of locating the
source or direction of a sound in space.
What is interaural time difference? - CORRECT ANSWER - Interaural time difference
(ITD) is the difference in the time of arrival of the sound at two ears; sound travels a shorter
distance to one ear.
What is the interaural level difference? - CORRECT ANSWER - Interaural level
difference (ILD) is the difference in the level of intensity of sound at two ears.
What is the head shadow? - CORRECT ANSWER - Head shadow is important in sound
localization of high frequencies, sound waves go around the head, decreasing intensity. The head
shadow does not occur for LOW frequency sounds.
How is the distance of the human head relate to the head shadow? - CORRECT
ANSWER - The human head is a barrier to frequencies less than 1,800Hz.
How does interaural level difference contribute to sound localization? - CORRECT
ANSWER - -Low frequency sounds have LESS of a contribution to ILD. Due to the
longer wavelength of low frequency sounds, these sounds are farther apart and will simply wrap
around the head without a decrease in intensity.
, -High frequency sounds will result in decreased intensity reaching the opposite ear (10-20dB
difference)
Describe the role of low frequencies in sound localization. - CORRECT ANSWER - -Low
frequencies have longer wavelengths.
-There is no sound shadow due to diffusion.
-Low frequencies provide LITTLE information about sound localization due to intensity
changes.
Describe the role of high frequencies in sound localization. - CORRECT ANSWER --
High frequencies have shorter wavelengths.
-Sound is blocked by the head, resulting in diffraction.
-There is reduced amplitude at the opposite ear.
-High frequencies AID in sound localization based on intensity differences.
How do the two ears contribute to sound localization? - CORRECT ANSWER - -ITD:
time
-ILD: level (head shadow and high frequency sounds)
What are the muscles of quiet (tidal) inspiration? - CORRECT ANSWER - -Diaphragm
-External intercostals
What are the muscles of forced inspiration? - CORRECT ANSWER - -Accessory muscles
of inspiration
What are the muscles of inspiration? - CORRECT ANSWER - -Diaphragm
-External intercostals (11 pairs)
-Some portions of the internal intercostals
Exam Questions and CORRECT Answers
How do the two ears relate to sound localization? - CORRECT ANSWER - -1 ear is
needed to process frequency and intensity
-2 ears are needed to locate sound
What are the cues of localization? - CORRECT ANSWER - -Temporal (time): phase
-Level (intensity)
What is localization? - CORRECT ANSWER - Localization is the process of locating the
source or direction of a sound in space.
What is interaural time difference? - CORRECT ANSWER - Interaural time difference
(ITD) is the difference in the time of arrival of the sound at two ears; sound travels a shorter
distance to one ear.
What is the interaural level difference? - CORRECT ANSWER - Interaural level
difference (ILD) is the difference in the level of intensity of sound at two ears.
What is the head shadow? - CORRECT ANSWER - Head shadow is important in sound
localization of high frequencies, sound waves go around the head, decreasing intensity. The head
shadow does not occur for LOW frequency sounds.
How is the distance of the human head relate to the head shadow? - CORRECT
ANSWER - The human head is a barrier to frequencies less than 1,800Hz.
How does interaural level difference contribute to sound localization? - CORRECT
ANSWER - -Low frequency sounds have LESS of a contribution to ILD. Due to the
longer wavelength of low frequency sounds, these sounds are farther apart and will simply wrap
around the head without a decrease in intensity.
, -High frequency sounds will result in decreased intensity reaching the opposite ear (10-20dB
difference)
Describe the role of low frequencies in sound localization. - CORRECT ANSWER - -Low
frequencies have longer wavelengths.
-There is no sound shadow due to diffusion.
-Low frequencies provide LITTLE information about sound localization due to intensity
changes.
Describe the role of high frequencies in sound localization. - CORRECT ANSWER --
High frequencies have shorter wavelengths.
-Sound is blocked by the head, resulting in diffraction.
-There is reduced amplitude at the opposite ear.
-High frequencies AID in sound localization based on intensity differences.
How do the two ears contribute to sound localization? - CORRECT ANSWER - -ITD:
time
-ILD: level (head shadow and high frequency sounds)
What are the muscles of quiet (tidal) inspiration? - CORRECT ANSWER - -Diaphragm
-External intercostals
What are the muscles of forced inspiration? - CORRECT ANSWER - -Accessory muscles
of inspiration
What are the muscles of inspiration? - CORRECT ANSWER - -Diaphragm
-External intercostals (11 pairs)
-Some portions of the internal intercostals
