Relations between psychophysical data and speech perception for hearing-impaired subjects. II

Area of Science:

• Audiology
• Speech-language pathology
• Neuroscience

Background:

• Sensorineural hearing impairment (SHI) in adolescents affects auditory processing.
• Understanding the relationship between basic auditory perception and speech understanding is crucial for intervention.

Purpose of the Study:

• To investigate the relationship between tone perception, phoneme perception, and speech perception in hearing-impaired adolescents.
• To determine the role of frequency selectivity and temporal resolution in speech reception thresholds.

Main Methods:

• Utilized a comprehensive battery of tests assessing loudness perception, frequency selectivity, and temporal resolution at 500, 1000, and 2000 Hz.
• Collected phoneme perception data through similarity judgments and phonemic confusions.
• Measured speech reception thresholds in quiet and noise, with and without low-pass and high-pass filtering.

Main Results:

• Speech hearing loss in adolescents correlates with reduced frequency resolving power and temporal processing abilities.
• Phoneme perception parameters showed a stronger association with filtered speech thresholds than unfiltered speech thresholds.
• This suggests a limited bridging role for phoneme perception between tone and speech perception.

Conclusions:

• Auditory processing deficits in frequency and time significantly impact speech perception in hearing-impaired adolescents.
• Phoneme perception's contribution to speech understanding may be context-dependent, particularly in challenging listening conditions.
• Further research is needed to fully elucidate the complex interplay between different levels of auditory processing.