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Behavioral Assessment of Hearing in 2 to 4 Year-old Children: A Two-interval, Observer-based Procedure Using Conditioned Play-based Responses
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The Audible Contrast Threshold (ACT) test: A clinical spectro-temporal modulation detection test.

Johannes Zaar1, Lisbeth Birkelund Simonsen2, Raul Sanchez-Lopez3

  • 1Eriksholm Research Centre, Rørtangvej 20, 3070 Snekkersten, Denmark; Hearing Systems Section, Department of Health Technology, Technical University of Denmark, Ørsteds Plads, Building 352, 2800 Kgs. Lyngby, Denmark.

Hearing Research
|September 7, 2024
PubMed
Summary

A new Audible Contrast Threshold (ACT™) test offers a quick and reliable measure of spectro-temporal modulation (STM) sensitivity for hearing-impaired individuals. This clinically viable test provides valuable beyond-audiogram insights, aiding in better hearing assessments.

Keywords:
AudiologyHearing lossReliabilitySpeech in noiseSpeech intelligibilitySupra-threshold audiometry

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Area of Science:

  • Audiology and Hearing Science
  • Auditory Perception
  • Signal Processing in Hearing

Background:

  • Hearing-impaired listeners' speech-in-noise ability correlates with spectro-temporal modulation (STM) detection.
  • Existing STM tests lack clinical viability due to duration, equipment, and standardization issues.
  • There is a need for a quick, reliable clinical tool for assessing STM sensitivity.

Purpose of the Study:

  • To introduce and validate a clinically viable STM test, the Audible Contrast Threshold (ACT™) test.
  • To establish normative data and a standardized scale (dB nCL) for the ACT test.
  • To assess the test-retest reliability and agreement with established STM paradigms.

Main Methods:

  • Developed an experimenter-controlled STM measurement paradigm with audibility-corrected noise and a Hughson-Westlake procedure.
  • Optimized a stimulation paradigm using 1-second windowed noise and logistic function fitting.
  • Collected data from hearing-impaired and normal-hearing participants using various transducers to establish normative data and the normalized Contrast Level (nCL) scale.

Main Results:

  • The optimized ACT test demonstrated excellent test-retest reliability and good agreement with established laboratory STM tests.
  • Normative data were obtained from normal-hearing participants, defining the normalized Contrast Level (nCL) scale.
  • The ACT test is quick, simple, and can be administered immediately after an audiogram using existing equipment.

Conclusions:

  • The ACT test is a reliable, quick, and clinically viable tool for assessing STM sensitivity in hearing-impaired individuals.
  • The ACT test provides valuable beyond-audiogram information, complementing traditional hearing assessments.
  • The normalized Contrast Level (nCL) offers a standardized measure of audible contrast loss.