Relationship between two measures of aided binaural advantage

Area of Science:

• Audiology
• Speech Perception
• Hearing Science

Background:

• Binaural squelch enhances speech intelligibility in noise by leveraging interaural time and intensity differences.
• Conventional measures assess aided binaural squelch using speech tests and comparing binaural to monaural performance.
• The ability to detect intelligibility differences between binaural and pseudobinaural stimuli offers an alternative measure of binaural processing.

Purpose of the Study:

• To investigate the relationship between conventional aided binaural squelch measures and binaural squelch inferred from detecting intelligibility differences.
• To determine if hearing-impaired individuals can utilize interaural differences to improve speech intelligibility in noise.

Main Methods:

• Conventional aided binaural squelch was measured using NU-6 monosyllables and revised SPIN sentences in speech-in-babble.
• Binaural squelch was calculated by comparing binaural speech intelligibility with monaural scores.
• Participants performed a paired-comparison task, selecting the more intelligible hearing-aid-processed speech sample between binaural and pseudobinaural stimuli.

Main Results:

• Hearing-impaired subjects demonstrated typical binaural squelch on conventional speech tests.
• However, most subjects could not distinguish between binaural and pseudobinaural stimuli in the paired-comparison task.
• This indicates a discrepancy between conventional measures and the actual ability to utilize interaural differences.

Conclusions:

• Conventional aided binaural squelch measures may not accurately reflect a listener's capacity to benefit from interaural differences.
• Many individuals with hearing impairment may have difficulty using interaural cues to enhance speech intelligibility in noisy situations.
• Further research is needed to understand the limitations of binaural processing in hearing-impaired listeners.