Audiology Praxis 5343
Exam 2023
What is the relationship between fundamental frequencies and harmonics? - AnswerF0= lowest freq component of a complex
... [Show More] periodic sound; harmonic is a regular and
repeating multiple of the f0
In which frequencies and at what intensities are most speech sounds produced? -
Answer-When applied to speech, the human voice spans a range from about 125Hz to
8kHz. 55-65 dB
Define threshold - Answer-"Threshold is defined as the lowest decibel hearing level at
which responses occur in at least one half of a series of ascending trials. The minimum
number of responses needed to determine the threshold of hearing is two responses
out of three presentations at a single level ."
What is the relationship between sound pressure level (SPL) and hearing level (HL)? -
Answer-dB HL normalizes SPL scale to 0 because we do not hear the same at all
frequencies. Our ears do not perceive low- and high-frequency sounds as well as they
do sounds between 500 and 4,000 Hz. Thus, normal hearing, if plotted on an audiogram
using the SPL scale, would be a curved, wavy line.
Describe the function of each of the three major parts of the hearing mechanism -
Answer-OUTER: Pinna-- Funneling of sound & localization. Ear canal-- Amplifies
sounds & protects TM
MIDDLE: Reduces impedance mismatch & Protects from loud sounds (also, Eustachian
tube equalizes pressure BC for the TM to vibrate, the air pressure needs to be equal on
each side of the TM.)
INNER: amplify sounds, frequency selectivity, converts sound to electrical signal,
maintain balance
Function of outer and inner hair cells? - Answer-OUTER: Amplification of displacement
on the traveling wave & frequency selectivity (active processes are here)
INNER: Nerve excitation= send signals to auditory nerve
What are the fluids found in the labyrinths of the inner ear? - Answer-Scala vestibuli:
Perilymph
Scala media: Endolymph
Scala tympani: Perilymph
What impacts can hearing loss cause for learning in children? - Answer-Delay in speech
and language, reduced academic achievement and vocabulary, lessened literacy skills,
social isolation and poor self-concept, vocational choices
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