AI Article Synopsis
- The study assessed how well a new pitch-coding strategy called OPAL improves Mandarin tone recognition in cochlear implant users.
- Compared to the standard ACE strategy, OPAL showed some benefits for recognizing tones in noisy environments but not in quiet settings.
- OPAL also maintained the understanding of Mandarin sentences in challenging noise and did not show significant differences in pitch discrimination compared to ACE.
Article Abstract
Objective: To evaluate the effectiveness of an experimental pitch-coding strategy for improving recognition of Mandarin lexical tone in cochlear implant (CI) recipients.
Design: Adult CI recipients were tested on recognition of Mandarin tones in quiet and speech-shaped noise at a signal-to-noise ratio of +10 dB; Mandarin sentence speech-reception threshold (SRT) in speech-shaped noise; and pitch discrimination of synthetic complex-harmonic tones in quiet. Two versions of the experimental strategy were examined: (OPAL) linear (1:1) mapping of fundamental frequency (F0) to the coded modulation rate; and (OPAL+) transposed mapping of high F0s to a lower coded rate. Outcomes were compared to results using the clinical ACE™ strategy.
Study Sample: Five Mandarin speaking users of Nucleus® cochlear implants.
Results: A small but significant benefit in recognition of lexical tones was observed using OPAL compared to ACE in noise, but not in quiet, and not for OPAL+ compared to ACE or OPAL in quiet or noise. Sentence SRTs were significantly better using OPAL+ and comparable using OPAL to those using ACE. No differences in pitch discrimination thresholds were observed across strategies.
Conclusions: OPAL can provide benefits to Mandarin lexical tone recognition in moderately noisy conditions and preserve perception of Mandarin sentences in challenging noise conditions.
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| http://dx.doi.org/10.1080/14992027.2016.1190872 | DOI Listing |
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