Automated Adaptive Wideband Acoustic Reflex Threshold Estimation in Normal-hearing Adults

Area of Science:

• Audiology
• Acoustic immittance testing
• Hearing diagnostics

Background:

• Acoustic stapedius reflex threshold (ART) tests are crucial for objective cross-checking of behavioral hearing results and lesion site identification.
• Traditional ART tests use a 226 Hz probe tone to estimate middle-ear admittance, which can be limited in scope.

Purpose of the Study:

• To compare Acoustic stapedius reflex threshold (ART) results obtained using a novel wideband (WB) automated adaptive method with traditional clinical methods.
• To investigate if WB ART testing yields lower thresholds compared to conventional methods in normal-hearing adults.

Main Methods:

• Prospective research design involving 39 normal-hearing adults.
• ARTs were measured using both a clinical manual method and an experimental WB automated adaptive system.
• Tests included ipsilateral and contralateral conditions with various pure-tone and broadband noise activators at tympanometric peak pressure (TPP) and ambient pressure.

Main Results:

• Wideband (WB) acoustic stapedius reflex threshold (ART) tests yielded significantly lower thresholds than the clinical method when measured at both TPP and ambient pressure.
• Specific ipsilateral conditions showed higher WB ARTs at TPP compared to ambient pressure.

Conclusions:

• WB automated adaptive ART testing provides lower thresholds in normal-hearing adults compared to clinical methods.
• The lower presentation levels and enhanced sensitivity of WB ART may improve patient tolerance and reduce the need for further audiological referrals.
• Test automation offers potential benefits for clinician efficiency and telehealth applications.