Some aspects of methodology in speech audiometry.

Area of Science:

• Audiology
• Speech Science
• Hearing Research

Background:

• Speech audiometry is crucial for assessing hearing ability.
• Existing methods for speech reception threshold (SRT) and speech discrimination scores have limitations in reliability.
• Factors influencing the precision of these measurements require further investigation.

Purpose of the Study:

• To investigate factors affecting the reliability of speech audiometric measurements.
• To develop and evaluate new speech materials and methods for speech reception threshold in noise (SRT in noise) testing.
• To assess the reliability of speech discrimination scores using binomial distribution.

Main Methods:

• Theoretical and clinical investigations using binomial distribution for speech discrimination reliability.
• Computer simulations and clinical studies to evaluate speech reception threshold (SRT) measurement reliability.
• Development and testing of new speech and noise materials for SRT in noise, including a 2x4-word method.

Main Results:

• Speech discrimination score reliability is surprisingly poor, depending on the score and word list length.
• New methods, like the 2x4-word method, showed improved speed and reliability over traditional methods.
• Developed speech and noise materials yielded steep intelligibility curves (25%/dB) and low standard deviations (0.44 dB for normal hearing) in SRT in noise measurements.

Conclusions:

• The reliability of speech audiometric measurements, particularly SRT in noise, can be significantly influenced by various factors.
• New speech materials and methods offer improved accuracy and efficiency for clinical SRT in noise assessments.
• The developed materials are well-suited for clinical application in measuring SRT in noise across different hearing levels.