Journal of Speech, Language, and Hearing Research Vol.55 276-289 February 2012. doi:10.1044/1092-4388(2011/10-0224)
© American Speech-Language-Hearing Association
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Article

Reduced Speech Perceptual Acuity for Stop Consonants in Individuals Who Stutter

Nicole E. Neefa
Martin Sommera
Andreas Neefa,,c
Walter Paulusa
Alexander Wolff von Gudenbergb
Kristina Jungb
Torsten Wüstenbergd
a Department of Clinical Neurophysiology, Georg August University, Göttingen, Germany
b Institute of the Kassel Stuttering Therapy, Bad Emstal, Germany
c Bernstein Focus Neurotechnology, Göttingen
d Charité Universitaetsmedizin, Berlin, Germany

Correspondence to Nicole Neef: nneef{at}gwdg.de

Purpose: In individuals who stutter (IWS), speech fluency can be enhanced by altered auditory feedback, although it has adverse effects in control speakers. This indicates abnormalities in the auditory feedback loop in stuttering. Current motor control theories on stuttering propose an impaired processing of internal forward models that might be related to a blurred auditory-to-motor translation. Although speech sound perception is an essential skill to form internal models, perceptual acuity has not been studied in IWS so far. The authors tested the stability of phoneme percepts by analyzing participants' ability to identify voiced and voiceless stop consonants.

Method: Two syllable continua were generated by systematic modification of the voice onset time. The authors determined speech perceptual acuity by means of discriminatory power in 25 IWS and 24 matched control participants by determining the phoneme boundaries and by quantifying the interval of voice onset times for which phonemes were perceived ambiguously.

Results: In IWS, discriminatory performance was weaker and less stable over time when compared with control participants. In addition, phoneme boundaries were located at longer voice onset times in IWS.

Conclusion: Persistent developmental stuttering is associated with less reliable phonological percepts, supporting current theories regarding the sensory–motor interaction in human speech.

KEY WORDS: phoneme categorization, speech perception, stuttering, voice onset time


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