Abstract
The effects of relative formant intensity on the phonetic identity of vowels were investigated in the present study. Ambiguous stimuli which were near the phonetic category boundary of /a/-/ɔ/, /u/-/ᴜ/, and /ɛ-/æ/ series were used to construct experimental stimuli by varying the intensity ratio between F1 and F2. The results showed that the perceived identity of these three sets of stimuli shifted towards /a/, /ᴜ/, and /æ/ when the intensity of F2 was increased, and shifted towards /ɔ/, /u/, and /ɛ/ when the intensity of F2 was decreased. The magnitude of effect was largest in stimuli of the /a/-/ɔ/ series, and smallest in stimuli of the /ɛ/-/æ/ series. The results suggest that (1) the relative intensity of formants does affect the phonetic identity of the stimuli, and (2) the frequency range within which spectral integration between adjacent formants can take place is not limited to 3 Barks, but follows a continuous probability function. [Work supported by NIH.]
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