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Cochlear implant (CI) users are unable to receive masking release and the reasons are unclear. The present study examines the hypothesis that when listening to speech in fluctuating maskers, CI users cannot fuse the pieces of the message over temporal gaps because they are not able to perceive reliably the information carried by obstruent consonants (e.g., stops). To test this hypothesis, CI users were presented with sentences containing clean obstruent segments, but corrupted sonorant segments (e.g., vowels). Results indicated that CI users received masking release at low signal-to-noise ratio levels. Experiment 2 assessed the contribution of acoustic landmarks alone by presenting to CI users noise-corrupted stimuli which had clearly marked vowel/consonant boundaries, but lacking clean obstruent consonant information. These stimuli were created using noise-corrupted envelopes processed using logarithmic compression during sonorant segments and a weakly-compressive mapping function during obstruent segments. Results indicated that the use of segment-dependent compression yielded significant improvements in intelligibility, but no masking release. The results from these experiments suggest that in order for CI users to receive masking release, it is necessary to perceive reliably not only the presence and location of acoustic landmarks (i.e., vowel/consonant boundaries) but also the information carried by obstruent consonants.

Masking release and the contribution of obstruent consonants on speech recognition in noise by cochlear implant users