1- stimulus and pathologic variables have been defined. However,

1- The
ASSR overcomes some of the limitations of ABR testing which include that the
steady-state response is evoked by pure tones that are amplitude and/or
frequency modulated unlike ABR which lack frequency specificity.

2-One of
the advantages of using ASSRs to determine residual hearing thresholds for
infants and children from whom ABRs could not be evoked. Also it determine
residual hearing thresholds for those infants and children from whom ABRs could
not be evoked.

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3- When
we compare ASSR to behavioral threshold the findings will be are very similar
both qualitatively and quantitatively.

5- A
disadvantage of ABR regarding audiologic applications is the subjective nature
of response detection while ASSR use objective detection using a set of
statistical criterion previously obtained.

 

STUDY 1: COMPARISON OF ASSR WITH
ABR RESULTS:

ABR may
be better because the technology is more widely available and many of the
stimulus and pathologic variables have been defined. However, in some cases,
ASSRs were present when ABRs were not, suggesting an advantage for ASSR. In
order to obtain the results, Behavioral Threshold Tests, ABR Threshold Tests
and ASSR Threshold Tests Were conducted.

 

Results:

1-The
results show that both click-ABR and ASSR have strong significant correlations.

2-The
discrepancy between behavioral and evoked potential threshold was generally
smaller for ASSR than for ABR.

3-Positive
values indicate that the evoked potential thresholds were found at levels greater
than for behavioral thresholds, and negative values mean that the evoked
potential thresholds were at levels less than behavioral thresholds. 

4-The correlation of ABR with pure- tone threshold was
marginally higher than for ASSR at 1 and 2 kHz, whereas at 4 kHz, the
correlations were identical.   

5-The correlations of c-ABR with pure-tone thresholds were
moderately robust. At 1 and 2 kHz, the pure tone-ABR correlation coefficients
slightly exceeded those for the ASSR.   

 

Discussion:

1-Unexpectedly
at 1 and 2 kHz, the pure tone-ABR correlation coefficients slightly exceeded
those for the ASSR.

2-The
differences between the ABR and ASSR correlation coefficients were small. The
correlations between the c-ABR threshold and the ASSR thresholds were
statistically significant.

3- These data suggest that both c-ABR and ASSR threshold estimates
can be used to predict pure tone threshold for infants and children who have
hearing thresholds in the normal to severe-to-profound range.   

5-Regarding
the ASSR, threshold was defined as the lowest level at which a statistically significant
(p

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