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Attempts to develop an efficient speech test in fully modulated noise

B Hagerman1

  • 1Department of Ear, Eye and Skin, Karolinska Institutet, Stockholm, Sweden.

Scandinavian Audiology
|January 1, 1997
PubMed
Summary
This summary is machine-generated.

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This study modified a speech test for efficiency. However, the new version showed worse reliability and a greater learning effect in normal-hearing subjects.

Area of Science:

  • Audiology
  • Speech Perception Research
  • Psychoacoustics

Background:

  • Previous speech tests in noise, like Hagerman (1982), aimed for efficiency.
  • Modifications were explored to enhance the performance of existing speech intelligibility tests.

Purpose of the Study:

  • To increase the efficiency of a previously developed speech test using sentences in noise.
  • To evaluate the impact of specific modifications on test reliability and intelligibility functions.

Main Methods:

  • Modified an existing speech test by using fully modulated noise.
  • Controlled the speech-to-noise ratio for each word to ensure consistent difficulty.
  • Tested the new version on 10 normal-hearing subjects.

Main Results:

Related Experiment Videos

  • The 10 generated lists demonstrated equal difficulty.
  • Compared to the older version, the new test exhibited reduced reliability.
  • A greater learning effect and a less steep intelligibility function slope were observed.

Conclusions:

  • Modifications, including fully modulated noise and controlled speech-to-noise ratios, did not improve test efficiency as intended.
  • Identical masking signals across lists may increase learning effects.
  • Strongly modulated noise appears to result in shallower intelligibility functions, impacting overall test performance.