Nozza R J, Miller S L, Rossman R N, Bond L C
Department of Otolaryngology, University of Pittsburgh School of Medicine.
J Speech Hear Res. 1991 Jun;34(3):643-50. doi: 10.1044/jshr.3403.643.
Infants were tested on a speech-sound discrimination-in-noise task using the visual reinforcement infant speech discrimination (VRISD) procedure with an adaptive (up-down) threshold protocol. An adult control group was tested using the same stimuli and apparatus. The speech sounds were synthetic magnitude of ba and magnitude of ga. The masker was band-passed presented continuously at 48 dB SPL. Test-retest reliability was good for both groups, although test-retest differences were smaller for adults. For infants the mean of the absolute values of the differences between tests was only 5.2 dB, and there was less than a 10-dB difference between the two tests of 14 (87.5%) of the 16 infants completing the study. The infant-adult difference in discrimination threshold in noise was 6.9 dB, which agrees well with detection-in-noise thresholds from earlier studies and with discrimination-in-noise thresholds obtained on a subset of subjects in our earlier work. Advantages of the adaptive threshold procedure and its possible applications both in research studies and in the clinic are discussed.
使用视觉强化婴儿语音辨别（VRISD）程序和自适应（上下）阈值协议，对婴儿进行了噪声中语音辨别任务测试。使用相同的刺激物和设备对一个成人对照组进行了测试。语音是“ba”的合成强度和“ga”的合成强度。掩蔽音以48 dB SPL的声压级连续带通呈现。两组的重测信度都很好，不过成人的重测差异较小。对于婴儿，两次测试之间差异绝对值的平均值仅为5.2 dB，在完成研究的16名婴儿中，有14名（87.5%）两次测试之间的差异小于10 dB。婴儿和成人在噪声中辨别阈值的差异为6.9 dB，这与早期研究中的噪声检测阈值以及我们早期工作中一部分受试者获得的噪声辨别阈值非常吻合。文中讨论了自适应阈值程序的优点及其在研究和临床中的可能应用。
