Otodynamics Otoport Flex - Page 201

Otoport OAE+ABR
User Manual for Otoport DP+TE model
201
Technical specications
• Reduction of the stimulus level to 30dBnHL would decrease
specicity to 95.5%, but increase the range of threshold
elevations to which the instrument is sensitive.
• Testing with a 60Hz powerline setting rather than 50Hz will
have an no signicant e󰀨ect on specicity since the ABR
response size change is minimal between 50 and 60 Hz
stimulus rates (Less than 1dB).
• Testing with a click stimulus rather than our short chirp will
slightly decrease specicity because click stimuli generate a
slightly smaller ABR response than a chirp of identical hearing
level (due to reduced synchronisation). The typical ABR
amplitude reduction for clicks relative to short chirps is of the
order of 3dB for near threshold stimulation. This translates to a
decrease in specicity to 98.6% with click stimuli.
*Norton, SJ, Gorga M P, Widen, JE, Folsom, RC, Sininger, YS, Cone-
Wesson, B, Vohr, BR and Fletcher, KA. Identication of Neonatal Hearing
Impairment: Summary and Recommendations, Ear & Hearing, 21:5, pp
529-535, 2000