were Several factors may contribute the results.
evoke a more synchronous neural response than modulated tones.
click evokes a wide pattern of excitation along the basilar membrane.
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.
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.·
are no significant diffaerences in threshold determination between the two
techniques (ABR and ASSR).·
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
use of an automatic detection algorithm for ASSR ensured that the
electrophysiologic responses were interpreted objectively.
There was no subject with
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. 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.