COMD 5070 Exam 2 2025 Questions and
Answers
how to calculate average air flow - --Answer --divide volume by time
ex. if 1 liter of air is used and phonation lasts for 5 seconds, average flow is 1/5
liter per second
(keep in mind that flow at a given instant may be different)
u-tube manometer - --Answer --measures static pressure (as opposed to
dynamic)
very low tech
not very good for speech production (because pressures change rapidly and subtly)
handy for calibration
measures in cmH2O (how many cm of water is displaced by the pressure)
rib cage and abdomen movements - --Answer --inhale: rib cage and
abdomen expand
exhale: rib cage and abdomen contract
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,measured by variable inductance plethysmograph
rib cage and abdomen movements during singing - --Answer --movement
increases rapidly during inhalation and drops more gradually during exhalation
- minimum resistance when inhaling
- when exhaling, phonation slows down the speed with which air leaves the lungs
rib cage and abdomen movements during speech - --Answer --exhalation is
slower than inhalation (laryngeal resistance slows down the flow of air as it leaves
your lungs)
subglottal pressure - --Answer --Ps or Psub
pressure below the larynx
driving pressure for phonation, speech
difficult to measure directly
normal speech values of subglottal pressure - --Answer --5-7 cmH2O
very loud: 15-20 cmH2O
lower for pulse register
higher for falsetto
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, estimating subglottal pressure - --Answer --measure intraoral pressure at a
particular time (during /p/ closure)
- vocal folds are abducted
- trachea and mouth are linked
- pressure is equal throughout the system
phonation threshold pressure - --Answer --pressure needed from the lungs
for folds to start vibrating
- between 3-5 cm needed to start, less to maintain
influences on PTP (phonation threshold pressure) - --Answer --increases
with:
- dehydration
- vocal fatigue
- many pathologies
folds are looser for easy onset, stiffer for harsh onset (PTP will be higher for
abrupt start)
vocal fold lesions increase mass, requiring more pressure to move
pressure (definition) - --Answer --force per unit area
....COPYRIGHT ©️ 2025 ALL RIGHTS RESERVED...TRUSTED & VERIFIED 3
Answers
how to calculate average air flow - --Answer --divide volume by time
ex. if 1 liter of air is used and phonation lasts for 5 seconds, average flow is 1/5
liter per second
(keep in mind that flow at a given instant may be different)
u-tube manometer - --Answer --measures static pressure (as opposed to
dynamic)
very low tech
not very good for speech production (because pressures change rapidly and subtly)
handy for calibration
measures in cmH2O (how many cm of water is displaced by the pressure)
rib cage and abdomen movements - --Answer --inhale: rib cage and
abdomen expand
exhale: rib cage and abdomen contract
....COPYRIGHT ©️ 2025 ALL RIGHTS RESERVED...TRUSTED & VERIFIED 1
,measured by variable inductance plethysmograph
rib cage and abdomen movements during singing - --Answer --movement
increases rapidly during inhalation and drops more gradually during exhalation
- minimum resistance when inhaling
- when exhaling, phonation slows down the speed with which air leaves the lungs
rib cage and abdomen movements during speech - --Answer --exhalation is
slower than inhalation (laryngeal resistance slows down the flow of air as it leaves
your lungs)
subglottal pressure - --Answer --Ps or Psub
pressure below the larynx
driving pressure for phonation, speech
difficult to measure directly
normal speech values of subglottal pressure - --Answer --5-7 cmH2O
very loud: 15-20 cmH2O
lower for pulse register
higher for falsetto
....COPYRIGHT ©️ 2025 ALL RIGHTS RESERVED...TRUSTED & VERIFIED 2
, estimating subglottal pressure - --Answer --measure intraoral pressure at a
particular time (during /p/ closure)
- vocal folds are abducted
- trachea and mouth are linked
- pressure is equal throughout the system
phonation threshold pressure - --Answer --pressure needed from the lungs
for folds to start vibrating
- between 3-5 cm needed to start, less to maintain
influences on PTP (phonation threshold pressure) - --Answer --increases
with:
- dehydration
- vocal fatigue
- many pathologies
folds are looser for easy onset, stiffer for harsh onset (PTP will be higher for
abrupt start)
vocal fold lesions increase mass, requiring more pressure to move
pressure (definition) - --Answer --force per unit area
....COPYRIGHT ©️ 2025 ALL RIGHTS RESERVED...TRUSTED & VERIFIED 3
