Pisoni D B, Lazarus J H
J Acoust Soc Am. 1974 Feb;55(2):328-33. doi: 10.1121/1.1914506.
Native speakers of English identified and then discriminated between stimuli which varied in voice onset time (VOT). One group of listeners identified a randomized sequence of stimuli; another group identified an ordered sequence of stimuli, in which stimuli from the VOT continuum were presented in a consecutive order. Half of the in each group then received one of two discrimination formats: the ABX discrimination test in which X was identified with A or with B, or 4IAX test of paired similarity in which two pairs of stimuli—one pair always the same and one pair always different—were presented on each trial. Noncategorical perception of the voicing distinction, reflected by an improvement in discrimination within phonetic categories, was obtained for the group of listeners who experienced both the sequential identification procedure and the 4IAX discrimination test. The results are interpreted as providing evidence for separate auditory and phonetic levels of discrimination in speech perception.
以英语为母语的人识别并区分了在语音起始时间（VOT）上有所变化的刺激。一组听众识别了一个随机排列的刺激序列；另一组听众识别了一个有序排列的刺激序列，其中来自VOT连续统的刺激是以连续顺序呈现的。然后，每组中的一半人接受两种辨别形式之一：ABX辨别测试，其中X要与A或B进行识别，或者是配对相似性的4IAX测试，每次试验会呈现两对刺激——一对总是相同，一对总是不同。对于经历了顺序识别程序和4IAX辨别测试的那组听众，获得了通过语音类别内辨别能力的提高所反映出的对语音区别的非范畴性感知。这些结果被解释为为语音感知中听觉和语音辨别水平的分离提供了证据。
