Abstract
The identification boundary shift after adaptation is now generally attributed to auditory contrast, rather than the operation of feature detectors. That this contrast must be in a prephonetic form was emphasized by the demonstration that mutual adaptation may take place even between vocalic and consonantal segments [J. J. Godfrey, J. Acoust. Soc. Am. Suppl. 1 66, S114(A) (1979)]. Further investigation shows that cross‐series adaptation may be obtained with brief vocalic stimuli differing in the amount of formant frequency transitions from steady‐state [e] to [eι]. Cross‐series adaptation was attempted with three adaptors: [ɔ], [ɔω], and [ɑι]. In the first two, F1 was identical to one of the test series stimuli, but F2 was different; in [ɑι], both F1 and F2 were different, but the directional pattern of formant changes resembled [eι]. Only the [ɑι] adaptor caused a boundary shift, suggesting a fairly abstract level of auditory contrast. [Work supported by NIH.]
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