Perceptual dereverberation in listeners with normal-hearing and cochlear implants.

Area of Science:

• Auditory Perception
• Speech Processing
• Acoustics

Background:

• Reverberation significantly degrades speech recognition, posing challenges in various acoustic environments.
• Perceptual dereverberation is a phenomenon where preceding non-target speech can improve target speech intelligibility in reverberation.
• Understanding dereverberation is crucial for developing assistive listening devices and auditory training programs.

Purpose of the Study:

• To investigate perceptual dereverberation in normal-hearing (NH) adults and cochlear implant (CI) users.
• To quantify the extent of speech recognition improvement due to perceptual dereverberation.
• To compare the effects of perceptual dereverberation with adaptation to masking noise.

Main Methods:

• Employed a within-subject repeated measures design with simulated reverberation and noise.
• Assessed speech recognition using digit triplet and consonant-vowel-consonant word tasks.
• Compared recognition with full stimuli versus stimuli containing only the final word or digit(s).

Main Results:

• NH listeners showed significant speech recognition improvement (26.5 RAU for digits, 9.0 RAU for words) with perceptual dereverberation.
• Recognition improvements in reverberation were larger than those observed with masking noise.
• CI users demonstrated a similar, though potentially confounded, improvement (18.6 RAU) in digit recognition.

Conclusions:

• Normal-hearing listeners effectively utilize perceptual dereverberation to enhance speech recognition in reverberant conditions.
• The findings suggest a distinct mechanism for dereverberation compared to noise adaptation.
• Further research is needed to confirm dereverberation effects in CI users and explore underlying mechanisms.