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CD 443 Exam 3 – Questions & Detailed Answers (Scored 100%)
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CD 443 Exam 3 – Questions & Detailed Answers (Scored 100%)
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CD 443 Exam 3 – Questions & Detailed Answers(Scored 100%)
Otoacoustic Emissions (OAEs) Right Ans - the ear naturally produces its
own sounds.
first reported by David Kemp in 1979.
low amplitude, almost always inaudible, and generated by outer hair cells.
outer hair cells Right Ans - responsible for our ability to hear very soft and
very loud sounds.
located on BM - push and pull to amplify BM response.
spontaneous OAEs Right Ans - continuous tonal signals that occur without
any stimulation.
present in about 50% of normal ears (inner AND middle)
T/F: A person may only have one SOAE at one time Right Ans - F: a person
may have several SOAEs at various frequencies occur simultaneously
evoked OAEs Right Ans - produced in response to an acoustic stimulus
2 kinds: transient and distortion
measuring OAEs Right Ans - a probe placed in the ear canal
- has 1 or 2 loud speakers and a microphone
- usually covered with a foam plug like those used for insert phones
- patient must be quiet and still
- takes 1-5 min per ear, depending ont he specific test
interpreting EOAEs Right Ans - to get a normal EOAE the cochlea has to
generate the emission
- requires no more than a mild SNHL for stimuli used in the clinic (loss < 40 dB
HL) ear has to transmit sound 2 ways:
- stimulus has to get to cochlea
- emission has to get to the ear canal
, - requires normal conductive mechanism
how hearing works? Right Ans - - outer and middle ears conduct sound
energy to the cochlea
- cochlea converts sound from mechanical movement to electrochemical
impulses
- these impulses travel up the auditory brainstem to the cortex
auditory evoked potentials Right Ans - recording how hearing works by
electrical activity with electrodes placed on the scalp
EEG Right Ans - electroencephalography - measuring electrical activity
from the brain
EPs Right Ans - evoked potentials - observing changes in brain activity in
response to specific stimuli
- electrical potentials that are evoked by a stimulus or event
- can measure EPs for all sorts of stimuli
measuring EPs Right Ans - - average ongoing EEG activity with both
positive and negative values, a response is always positive or negative, if we
sum the EEG activity over time, the response will emerge from the noise
compared to ongoing neural activity, responses to stimuli are __________
Right Ans - very small
latency Right Ans - the timing of a response relative to the stimulus
electrocochleography (ECoG) Right Ans - earliest responses that are
recorded from the cohlea
event related potentials (ERPs) Right Ans - the latest responses that are
recorded that come from the auditory cortex
auditory brainstem response (ABR) Right Ans - the response that has the
widest clinical application, occurs in the first 10-15 ms after the stimulus, it
implies a normal cochlea, auditory nerve and brainstem
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