الفهرس 
REVIEW OF LITERATUREOnly 14 pages are availabe for public view
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Abstract
The auditory evoked potential techniques (AEP) are used for the
objective estimation of hearing threshold. The auditory brainstem
response (ABR) is one of the most common of these techniques (Madi et
al., 2016). The auditory steady-state response (ASSR) is one of the recent
techniques which is used as an alternative method for objective
audiometry (Bidelman and Bhagat, 2016).
Multiple narrow-band (NB) chirps are used in the new ASSR
systems for stimulus presentation. Chirps have the advantages of higher
potential amplitude, greater neural synchronization, and decrease in the
testing times in comparison to the modulated tone (Elbring et al., 2007;
Dau et al., 2000).
Few studies examined chirp ASSR system instead of the modulated
continues tones, so this study aimed at comparison between the pure tone
audiometry (PTA) thresholds & chirps ASSR thresholds in adult
population to detect reliability of ASSR in threshold determination in
clinical practice.
This study was conducted on 35 adults (70 ears) recruited from
outpatient audiology clinic, in the period between December 2017 to
October 2018 with inclusion criteria of adults with ages ranging from 18-
60 years with no restriction regarding audiometric configuration or level.
Ethical approval and consent from all the patients were taken.
Subjects in the current study were classified into 4 groups according to
the degree of hearing loss; normal hearing group with hearing level (< 25
dB HL), mild hearing loss (HL) group with hearing level (26–40 dB HL),
moderate to moderately severe (HL) group with hearing level (41–70 dB
HL) and the last group was severe to profound (HL) group with hearing