Kishon-Rabin Liat, Kochva Rotem, Kigel Sharon, Rotshtein Shira, Roth Daphne Ari-Even
Department of Communication Disorders, Sackler Faculty of Medicine, Tel Aviv University, Israel.
J Basic Clin Physiol Pharmacol. 2005;16(2-3):173-87. doi: 10.1515/jbcpp.2005.16.2-3.173.
Category boundary (CB) of Hebrew voicing on voice-onset time (VOT) continuum was found to be different from non-speech stimuli on tone-onset time (TOT) continuum. This is in contrast to data in English, thus suggesting that CB for speech stimuli may be determined not only by general auditory sensitivities but by additional factors that may be speech specific. The data in Hebrew voicing, however, can also be explained by the fact that in Hebrew voicing, two categories were available to the listener, whereas for the TOT stimuli there were three: leading, simultaneous and lagging temporal events. The purpose of the present study was to investigate the effect of number of perceptual categories on CB of non-speech analogs of voicing in Hebrew-speaking subjects and compare them to those obtained on a VOT continuum. Twenty-four Hebrew-speaking adults participated in this study. Stimuli consisted of (a) a two-tone complex continuum that varied in the relative onset time of the lower frequency tone, and (b) a /ba-pa/ continuum which varied in VOT values similar to (a). The same TOT continuum was tested twice. In one, subjects identified TOT stimuli as belonging to one of three categories (TOT3): leading, simultaneous, or lagging; and in the other to two categories of TOT (TOT2): leading or lagging. VOT stimuli were labeled as /ba/ or /pa/. Results show that (1) when listeners were offered only two perceptual categories of temporal events, the pattern of identification functions matched one of the two functions shown for TOT3, and (2) the category boundary of VOT stimuli was similar for all subjects regarding the value calculated for TOT2. The present study supports the hypotheses that (1) CB of non-speech stimuli is not influenced by the number of perceptual categories available to the listener, and (2) different mechanisms may underlie the categorical perception of speech versus non-speech stimuli.
研究发现，希伯来语发声在嗓音起始时间（VOT）连续统上的类别边界与非言语刺激在音调起始时间（TOT）连续统上的类别边界不同。这与英语中的数据形成对比，这表明言语刺激的类别边界可能不仅由一般听觉敏感性决定，还由可能特定于言语的其他因素决定。然而，希伯来语发声中的数据也可以用以下事实来解释：在希伯来语发声中，听众有两个类别可供选择，而对于TOT刺激有三个：领先、同时和滞后的时间事件。本研究的目的是调查感知类别数量对说希伯来语受试者中发声非言语类似物的类别边界的影响，并将其与在VOT连续统上获得的结果进行比较。24名说希伯来语的成年人参与了这项研究。刺激包括：（a）一个双音复合连续统，其低频音的相对起始时间不同；（b）一个 /ba-pa/ 连续统，其VOT值与（a）相似。相同的TOT连续统被测试了两次。在一次测试中，受试者将TOT刺激识别为属于三个类别（TOT3）之一：领先、同时或滞后；在另一次测试中，将其识别为两个TOT类别（TOT2）：领先或滞后。VOT刺激被标记为 /ba/ 或 /pa/。结果表明：（1）当听众只被提供两个时间事件的感知类别时，识别函数的模式与TOT3所示的两个函数之一相匹配；（2）对于所有受试者，VOT刺激的类别边界在为TOT2计算的值方面是相似的。本研究支持以下假设：（1）非言语刺激的类别边界不受听众可用感知类别数量的影响；（2）言语与非言语刺激的类别感知可能有不同的机制。
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