Recognition of voiceless fricatives by normal and hearing-impaired subjects.
Recognition of voiceless fricatives by normal and hearing-impaired subjects.
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DOI：
10.1044/jshr.3303.440
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发表时间：
1990-09
期刊：
影响因子：
--
通讯作者：
F. Zeng;C. Turner
中科院分区：
文献类型：
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作者：
F. Zeng;C. Turner
本研究的目的是考察正常听者和听障成人受试者在识别四个清音摩擦辅音[S，f，西塔，积分of]和相同元音[i：]时所使用的足够的知觉线索。受试者在一系列呈现水平的闭合反应任务中辨认出四个简历语音标记。摩擦音节要么由自然刺激集中的人类说话者产生，要么由合成刺激集中的计算机程序产生。通过比较受试者被呈现给个体摩擦音的等同程度的可听性的条件，有可能将缺乏可听性的因素与丧失阈值以上辨别能力的因素分离出来。结果表明：(A)对于正常听力受试者来说，摩擦爆发部分可以作为正确识别清音摩擦音的充分线索，而较强的CV转换部分虽然可能不是必需的，但也能帮助这些受试者辨别位置信息，特别是在低呈现水平下；(B)当给予等同程度的摩擦提示时，听障受试者获得了接近正常的识别成绩，但如果只给予等同程度的过渡提示，他们的识别成绩不如正常受试者；(C)听力受损的受试者在正常情况下难以感知摩擦，可能是由于两个因素：听不到摩擦线索和失去对过渡线索的辨别能力。
The purpose of this study was to investigate the sufficient perceptual cues used in the recognition of four voiceless fricative consonants [s, f, theta, integral of] followed by the same vowel [i:] in normal-hearing and hearing-impaired adult listeners. Subjects identified the four CV speech tokens in a closed-set response task across a range of presentation levels. Fricative syllables were either produced by a human speaker in the natural stimulus set, or generated by a computer program in the synthetic stimulus set. By comparing conditions in which the subjects were presented with equivalent degrees of audibility for individual fricatives, it was possible to isolate the factor of lack of audibility from that of loss of suprathreshold discriminability. Results indicate that (a) the friction burst portion may serve as a sufficient cue for correct recognition of voiceless fricatives by normal-hearing subjects, whereas the more intense CV transition portion, though it may not be necessary, can also assist these subjects to distinguish place information, particularly at low presentation levels; (b) hearing-impaired subjects achieved close-to-normal recognition performance when given equivalent degrees of audibility of the frication cue, but they obtained poorer-than-normal performance if only given equivalent degrees of audibility of the transition cue; (c) the difficulty that hearing-impaired subjects have in perceiving fricatives under normal circumstances may be due to two factors: the lack of audibility of the frication cue and the loss of discriminability of the transition cue.