ASA 129th Meeting - Washington, DC - 1995 May 30 .. Jun 06

5pSC32. Intersyllabic regulation of F0 and SPL with and without auditory feedback.

Jane Wozniak

Harlan Lane

Joyce Manzella

Joseph Perkell

Melanie Matthies

Mario Svirsky

Michael O'Connell

Clay Mitchell

Res. Lab. of Electron., Rm. 36-511, MIT, Cambridge, MA 02139

Syllable-to-syllable fluctuation of F0 and SPL were measured in readings of a passage by 4 post-lingually deafened adults, recorded before and after they received cochlear implants, and one adult with neurofibromatosis-2 (NF2), who was initially profoundly deaf in one ear and had a mild to moderate hearing loss in the other (aided). Three of the 4 cochlear implant users reliably reduced syllable-to-syllable fluctuation in F0 and SPL following the activation of their speech processors. The fourth speaker began with and maintained the regularity achieved by the others post-activation. In recordings made following the onset of bilateral profound deafness, the NF2 subject showed increased syllable-to-syllable fluctuation in F0 and SPL. Results from another experiment [M. A. Svirsky et al., 1284--1300 (1992)], in which multiple repetitions of vowels in an /hVd/ context were produced by cochlear implant users with their processors turned off and on, suggest that some subjects showed less token-to-token variability in F0 and SPL with their processors turned on. The present results indicate that auditory feedback may also constrain the syllable-to-syllable variability of F0 and SPL contours. [Work supported by NIDCD.]