### ASA 128th Meeting - Austin, Texas - 1994 Nov 28 .. Dec 02

## 3aSP15. A linear model of boundary shifts in /(small capital you)--(small
capital eye)/ and /(open oh)--(cursive beta)/ continua.

**Anna K. Nabelek
**
Alexandra Ovchinnikov

**
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*Dept. of Audiol. and Speech Pathol., The Univ. of Tennessee, Knoxville, TN
3796-0740
*

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Boundary locations were tested for /(small capital you)--(small capital
eye)/ and /(open oh)--(cursive beta)/ continua with steady-state or linearly
changing formants in which F2 was varied. F1 and F2 trajectories had upward and
downward directions. Boundary shifts were calculated for changing formant
stimuli relative to the boundary for steady-state stimuli. The directions of
boundary shifts indicated perceptual emphasis of the final segments of F2
trajectory which might be a consequence of low-frequency spread of masking from
F1 to F2. A linear model was developed in which boundary shifts were related to
spectral distance between F1 and F2 trajectories. Parameters were initial and
final frequencies of F1 and boundary F2 established for each continuum with
steady-state stimuli. When the distance was constant in time shifts depended on
directions of F1 and F2 trajectories, described by two model terms containing
differences of initial and final frequencies of F1 and F2. When the distance
was changing in time additional shift was toward the greater spectral distance,
described by two model terms containing ratios of initial and final
frequencies. [Work supported by NIH.]