SHS 401 Comprehensive Resource To Help You Ace 2026-2027 Exams Includes Frequently
Tested Questions With Elaborated 100% Correct Complete Solutions
Guaranteed Pass First Attempt!! Current Update!!
Human ears are not isolated. acoustically
Tones presented via to one
air conduction
ear can be loud enough to stimulate the opposite ear via
bone conduction
.
When a tone is presented to one ear at a given level and
is heard at a lower level in the opposite ear.
The level of the tone in the "test ear" and the loss in
Crossover Hearing signal strength as it passes to the opposite "non-test ear"
determines whether or not the tone is heard.
*also referred to as "crossover", "shadow curve",
"interau-ral attenuation"
The decrease in the level of acoustic signal (in dB) as it
passes from one ear to the cochlea of the opposite ear.
*the ditterence in the level of the acoustic signal at the two
ears.
Interaural attenuation
40 dB for supra-aural earphones
70 dB for insert earphones
The lowest acceptable interaural attenuation at which
*Anytime the air-conduction threshold in one ear ditters
crossover might occur
from the air or bone conduction threshold in the other
ear, by 40 or 70 dB, crossover may have occurred and the
better ear will need to be isolated acoustically.
, SHS 401 Comprehensive Resource To Help You Ace 2026-2027 Exams Includes Frequently
Tested Questions With Elaborated 100% Correct Complete Solutions
Guaranteed Pass First Attempt!! Current Update!!
The examiner is not getting true thresholds for the worse a test signal delivered to the poorer ear may be heard via
ear when: bone conduction in the better ear.
0 dB
*When you place the bone vibrator on the mastoid, the
Interaural attenuation for bone conduction tone may be heard in both ears. So, when a patient re-
sponds "yes I hear it" you really don't know in which
ear the tone was heard. However, we can assume that
the patient hears the tone in the ear with the better
If we wish to determine the hearing sensitivity of cochlea.
, we must make sure the test signals are not
one ear
heard in the .
opposite ear
Masking with noise allows us to
.
acoustically isolate the test ear.
Masking is not a thing, it's a . process
Using a particular type of stimulus to occupy an ear we
want to get out of the test.
*Audiometers are equipped to present narrow bands of
noise with center frequencies at standard audiometric test
frequencies.
*These narrow-band noises have bandwidths somewhat
Masking for tones
wider than the critical bands at each frequency. Narrow so
they are not too loud.
*Use narrow-band noises in non-test ear and critical (pure
tones) in test ear.
Speech-shaped noise is used to mask speech stimuli (e.g.
Masking for speech audiometry a filtered white noise with a pass band from 500-4000
, SHS 401 Comprehensive Resource To Help You Ace 2026-2027 Exams Includes Frequently
Tested Questions With Elaborated 100% Correct Complete Solutions
Guaranteed Pass First Attempt!! Current Update!!
Hz).
Tested Questions With Elaborated 100% Correct Complete Solutions
Guaranteed Pass First Attempt!! Current Update!!
Human ears are not isolated. acoustically
Tones presented via to one
air conduction
ear can be loud enough to stimulate the opposite ear via
bone conduction
.
When a tone is presented to one ear at a given level and
is heard at a lower level in the opposite ear.
The level of the tone in the "test ear" and the loss in
Crossover Hearing signal strength as it passes to the opposite "non-test ear"
determines whether or not the tone is heard.
*also referred to as "crossover", "shadow curve",
"interau-ral attenuation"
The decrease in the level of acoustic signal (in dB) as it
passes from one ear to the cochlea of the opposite ear.
*the ditterence in the level of the acoustic signal at the two
ears.
Interaural attenuation
40 dB for supra-aural earphones
70 dB for insert earphones
The lowest acceptable interaural attenuation at which
*Anytime the air-conduction threshold in one ear ditters
crossover might occur
from the air or bone conduction threshold in the other
ear, by 40 or 70 dB, crossover may have occurred and the
better ear will need to be isolated acoustically.
, SHS 401 Comprehensive Resource To Help You Ace 2026-2027 Exams Includes Frequently
Tested Questions With Elaborated 100% Correct Complete Solutions
Guaranteed Pass First Attempt!! Current Update!!
The examiner is not getting true thresholds for the worse a test signal delivered to the poorer ear may be heard via
ear when: bone conduction in the better ear.
0 dB
*When you place the bone vibrator on the mastoid, the
Interaural attenuation for bone conduction tone may be heard in both ears. So, when a patient re-
sponds "yes I hear it" you really don't know in which
ear the tone was heard. However, we can assume that
the patient hears the tone in the ear with the better
If we wish to determine the hearing sensitivity of cochlea.
, we must make sure the test signals are not
one ear
heard in the .
opposite ear
Masking with noise allows us to
.
acoustically isolate the test ear.
Masking is not a thing, it's a . process
Using a particular type of stimulus to occupy an ear we
want to get out of the test.
*Audiometers are equipped to present narrow bands of
noise with center frequencies at standard audiometric test
frequencies.
*These narrow-band noises have bandwidths somewhat
Masking for tones
wider than the critical bands at each frequency. Narrow so
they are not too loud.
*Use narrow-band noises in non-test ear and critical (pure
tones) in test ear.
Speech-shaped noise is used to mask speech stimuli (e.g.
Masking for speech audiometry a filtered white noise with a pass band from 500-4000
, SHS 401 Comprehensive Resource To Help You Ace 2026-2027 Exams Includes Frequently
Tested Questions With Elaborated 100% Correct Complete Solutions
Guaranteed Pass First Attempt!! Current Update!!
Hz).
