Eberwein Cynthia A, Pratt Sheila R, McNeil Malcolm R, Fossett Tepanta R D, Szuminsky Neil J, Doyle Patrick J
VA Pittsburgh Healthcare System, Audiology and Speech Pathology, 7180 Highland Drive, Pittsburgh, PA 15206, USA.
J Speech Lang Hear Res. 2007 Aug;50(4):865-77. doi: 10.1044/1092-4388(2007/061).
To assess the Computerized Revised Token Test (CRTT) performance of individuals with normal hearing under several intensity conditions and under several spectral and temporal perturbation conditions.
Sixty normal-hearing listeners were randomly assigned to 1 of 3 groups. Group 1 provided performance-intensity information about CRTT performance using uncompressed acoustic stimuli. Groups 2 and 3 completed the CRTT using temporally and spectrally compressed and expanded stimuli. CRTT performance functions were plotted for each group.
Group 1 required minimal audibility to perform maximally on this task. As expected, Groups 2 and 3 showed significant differences across subtests, regardless of distortion condition. Mean differences in performance between successive conditions for Group 2 increased beyond 40% time compressed. There was 1 significant difference for the time-expanded condition. There were no differences across frequency compressed and expanded conditions.
Young listeners require limited signal gain on the CRTT to achieve maximum performance. Time and frequency compression and expansion results were consistent with previous findings with varying types of speech stimuli. The results have implications for administration and interpretation of the CRTT administered to persons from other populations and will help in the development of a normative database for the CRTT.
评估听力正常个体在几种强度条件下以及几种频谱和时间扰动条件下的计算机化修订令牌测试（CRTT）表现。
60名听力正常的受试者被随机分配到3组中的1组。第1组使用未压缩的声学刺激提供有关CRTT表现的性能强度信息。第2组和第3组使用时间和频谱压缩及扩展的刺激完成CRTT。为每组绘制CRTT性能函数。
第1组在执行此任务时需要最小可听度才能达到最佳表现。正如预期的那样，无论失真条件如何，第2组和第3组在各子测试中均表现出显著差异。第2组连续条件之间的表现平均差异在时间压缩超过40%时增加。时间扩展条件下有1个显著差异。在频率压缩和扩展条件下没有差异。
年轻受试者在CRTT上需要有限的信号增益才能达到最佳表现。时间和频率压缩及扩展结果与先前使用不同类型言语刺激的研究结果一致。这些结果对向其他人群进行CRTT的管理和解释具有启示意义，并将有助于建立CRTT的标准化数据库。
