ASA 129th Meeting - Washington, DC - 1995 May 30 .. Jun 06
5pSC30. Laxness of voice quality integrates with F1 (usually, but not
always, negatively).
Laura Walsh
Christine Bartels
John Kingston
Linguistics Dept., Univ. of Massachusetts, Amherst, MA 01003
Neil A. Macmillan
Brooklyn College, Brooklyn, NY 11210
Both lax voice and advanced tongue root typically concentrate energy at
low frequencies: Laxing the voice increases the relative prominence of the
first harmonic, and advancing the tongue root lowers F1. A previous study
[Thorburn et al., 2871 (A) (1994)] using the Garner paradigm found
that these acoustically similar effects integrated perceptually for vowels in
CVC context. In this study, the range of voice quality was extended to include
tensor values. Across the entire set of voice qualities sampled in the two
experiments, laxness integrated negatively with F1 at the lax and tense ends of
the continuum but positively at intermediate values. This pattern of mean
integrality is distinct from the additional finding of variance integrality,
that is, greater uncertainty in judging voice quality when F1 varied than when
it did not (and similarly for judgments of F1). According to a model of Durlach
et al. [Percept. Psychophys. 46, 293--296 (1989)], the variance-integrality
effects can be attributed to a sensory rather than a context-coding source.
[Work supported by NSF and NIH.]