Experience-dependent learning effects in speech production with spectrally degraded feedback

Elizabeth Casserly, David B. Pisoni

Research output: Contribution to journalConference article


This study examined the speech of normal-hearing adult participants before and during their use of a portable, real-time vocoder (PRTV). The PRTV continuously transforms environmental acoustics, including speakers' own speech feedback, via a real-time simulation of cochlear implant processing. The impacts of this substantial spectral degradation on speech production were measured in three groups of subjects: Group 1 received altered acoustic feedback for one continuous 55 minute session; Group 2 experienced the feedback transformation for one session of 6 hours total; and Group 3 wore the PRTV for four consecutive sessions of 4 hours each, for a total of 16 hours of experience. Speakers in each group were recorded producing 114 isolated English words and 24 sentences both before their feedback manipulation began and at periodic intervals during their experimental session(s). Acoustic-phonetic analyses of the speech produced by subjects in all three groups revealed substantial effects of the spectral feedback degradation in several domains, including fluency/speaking rate, vocal affect, and vowel quality. Speakers were able to adjust and recover quickly in some of these areas, such as affect, while other changes, such as those in vowel quality and speaking rate, remained despite 16 hours of experience with the acoustic transformation.

Original languageEnglish (US)
Article number060148
JournalProceedings of Meetings on Acoustics
StatePublished - Jun 19 2013
Externally publishedYes
Event21st International Congress on Acoustics, ICA 2013 - 165th Meeting of the Acoustical Society of America - Montreal, QC, Canada
Duration: Jun 2 2013Jun 7 2013

ASJC Scopus subject areas

  • Acoustics and Ultrasonics

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