There of a click will evoke a

There
were Several factors may contribute the results.
·        
Clicks
evoke a more synchronous neural response than modulated tones.
·        
The
click evokes a wide pattern of excitation along the basilar membrane.
·        
The
instantaneous rise time of a click will evoke a synchronous firing from those
neurons with the shortest group latency delays in the basal end of the
cochlea.

Tone-ABR
and ASSR could both be used to estimate hearing threshold but that the
stimulus used (tone burst versus AM + FM tone) and detection method
(algorithm versus visual detection) affected the threshold determination.
 

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What
learn from all article?

·        
There
are no significant diffaerences in threshold determination between the two
techniques (ABR and ASSR).

·        
Advantage
for ASSR in the determination of residual hearing for those with
severe-to-profound and profound hearing losses; tb-ABR tests for this severity
of hearing loss typically showed “no response” at transducer output
limits.

·        
The
use of an automatic detection algorithm for ASSR ensured that the
electrophysiologic responses were interpreted objectively.

                                     

 

 

 

 

 

Strength and weakness for each
study:

 

Study 1:
Comparison of ASSR with ABR results

Study 2:
Direct comparison of ASSR and tone burst-evoked ABR

Strength

·        
The discrepancy between behavioral
and evoked potential threshold was generally smaller for ASSR than for ABR,
but the standard deviation of the difference was essentially the same for
both.

·        
They take the noise levels in
consideration were they calculated it as a function of MF.
·        
There are only a few studies
reporting ASSR thresholds in normal-hearing adults, and this study one of
them.

Weakness

·        
There was no subject with
retrocochlear dysfunction.
·        
The study was mention that 10
subjects had normal hearing or a mixed-type loss but they did not mention the
numbers of each.
·        
It is rarely time to perform
multiple measures of threshold at anyone frequency or to evaluate
reliability.

·        
The Participants only female.
·        
Only one ear was tested for each
participant; in six cases, the left ear and 4 the right ear, and they did not
explain why they test one ear and on what depend when they select the ear.
·        
Previous studies comparing ASSR to
tb-ABR have employed visual detection alone for ABR threshold estimates and
have only compared tone ABR to ASSR at one frequency or at one MF. While, this
study they compared tone ABR to ASSR at multiple frequency or at multiple MF.

 

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