![]() ![]() Smearing occurs as a natural byproduct from clicks, and smearing also occurs (although to a lesser degree) with TBs.įigure 2. These detrimental effects to the response are due to a mismatch between the timing of the different frequency components within the stimulus and the travel time for different frequencies within the cochlea. When these stimuli are presented they produce a “less than ideal” response because hair cells of the cochlea are stimulated at different absolute times, creating a “smearing” effect which diminishes the amplitude of the ABR in general, and wave V in particular. Indeed, the auditory evoked response relies on the rapid “synchronous” firing of the auditory nerve to generate a tiny electrical signal which can be averaged and recorded.Ĭlick and TB stimuli each stimulate a specific frequency range. BackgroundĬlicks and Tone Bursts (TBs) used in tandem with (or for) auditory brainstem response (ABR) audiometry haven’t changed much over the last four decades. As such, this article will focus on a new family of acoustic stimuli, Level Specific CE-Chirps©, and the science of them. ![]() It is our nature to view new technologies with some degree of skepticism-and rightfully so! Evidence-based research is critically important to support the introduction of new technologies. As would be expected, education and a pragmatic understanding of new technologies play a role in one’s ability to accept change. Indeed, it often takes years (and sometimes decades) for many of these important technologies to become commonplace in clinics around the world. ![]() ![]() We’ve often witnessed the introduction of exciting and fascinating diagnostic technologies (ie, otoacoustic emissions, auditory brainstem response, acoustic reflexes, tympanograms, and more) which are reluctantly embraced over years and decades-until they become mandatory and irreplaceable! There is substantial evidence to support the use of the CE-Chirp for threshold estimation in lieu of click and tone burst stimuli.Ĭutting edge technological advances generate a range of reactions within the professional community from reluctance, skepticism, and fear to enthusiasm, excitement, and anticipation. Tech Topic | February 2016 Hearing Reviewīy David P. ![]()
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