ASA 127th Meeting M.I.T. 1994 June 6-10

4pSP22. Frequency contrast and the effect of preceding liquid on perception of place of articulation.

Andrew J. Lotto

Keith R. Kluender

Dept. of Psychol., Univ. of Wisconsin, Madison, WI 53706

Perception of syllable-initial /d/ and /g/ can be affected by the composition of preceding acoustic information such that, for a series of synthesized consonant-vowel syllables (CVs) varying in onset characteristics of the third formant (F3) and varying perceptually from /da/ to /ga/, subjects are more likely to perceive /da/ when preceded by the syllable /al/, and to perceive /ga/ when preceded by /ar/ [V. A. Mann, Percept. Psychophys. 28, 407--412 (1980)]. In the present studies, this initial finding was replicated, and a second experiment was conducted to evaluate the extent to which the effect could be attributed to general properties of auditory perception. Members of a 10-step series of /da-ga/ syllables varying in F3 onset frequency were preceded by the syllables /ar/ and /al/ and by frequency modulated (FM) glide analogues of F3 from those syllables. Analogues were 150-ms sine wave glides that followed the trajectory of F3 in /al/ or in /ar/, and were amplitude matched to the rms energy within a critical and in the vicinity of F3 for the /al/ or /ar/ syllables. The effects of single FM glides were analogous to those found for /al/ and /ar/, thus suggesting that general contrast effects may be implicated. [Work supported by NIDCD grant DC-00719 and NSF grant DBS-9258482.]