ERIC Number: EJ1145903
Record Type: Journal
Publication Date: 2017-May
Abstractor: As Provided
Reference Count: N/A
Speech Rate Normalization and Phonemic Boundary Perception in Cochlear-Implant Users
Jaekel, Brittany N.; Newman, Rochelle S.; Goupell, Matthew J.
Journal of Speech, Language, and Hearing Research, v60 n5 p1398-1416 May 2017
Purpose: Normal-hearing (NH) listeners rate normalize, temporarily remapping phonemic category boundaries to account for a talker's speech rate. It is unknown if adults who use auditory prostheses called cochlear implants (CI) can rate normalize, as CIs transmit degraded speech signals to the auditory nerve. Ineffective adjustment to rate information could explain some of the variability in this population's speech perception outcomes. Method: Phonemes with manipulated voice-onset-time (VOT) durations were embedded in sentences with different speech rates. Twenty-three CI and 29 NH participants performed a phoneme identification task. NH participants heard the same unprocessed stimuli as the CI participants or stimuli degraded by a sine vocoder, simulating aspects of CI processing. Results: CI participants showed larger rate normalization effects (6.6 ms) than the NH participants (3.7 ms) and had shallower (less reliable) category boundary slopes. NH participants showed similarly shallow slopes when presented acoustically degraded vocoded signals, but an equal or smaller rate effect in response to reductions in available spectral and temporal information. Conclusion: CI participants can rate normalize, despite their degraded speech input, and show a larger rate effect compared to NH participants. CI participants may particularly rely on rate normalization to better maintain perceptual constancy of the speech signal.
Descriptors: Assistive Technology, Speech Acts, Speech Communication, Phonemes, Auditory Stimuli, Auditory Tests, Control Groups, Experimental Groups, Delivery Systems, Effect Size, Timed Tests, Adult Programs, Achievement Gains
American Speech-Language-Hearing Association. 2200 Research Blvd #250, Rockville, MD 20850. Tel: 301-296-5700; Fax: 301-296-8580; e-mail: firstname.lastname@example.org; Web site: http://jslhr.pubs.asha.org
Publication Type: Journal Articles; Reports - Research
Education Level: N/A
Sponsor: National Institutes of Health (DHHS)
Authoring Institution: N/A
Grant or Contract Numbers: R01AG051603|P30DC004664|T32DC000046E