Kidd Joanna C, Hogben John H
Department of Psychology, The University of Hong Kong, 721 Knowles Building, Pokfulam Road, Hong Kong, SAR, China.
J Speech Lang Hear Res. 2007 Aug;50(4):982-98. doi: 10.1044/1092-4388(2007/069).
Where the auditory saltation illusion has been used as a measure of auditory temporal processing (ATP) in dyslexia, conflicting results have been apparent (cf. R. Hari & P. Kiesilä, 1996; M. Kronbichler, F. Hutzler, & H. Wimmer, 2002). This study sought to re-examine these findings by investigating whether dyslexia is characterized by poor saltation task performance and whether saltation thresholds are related to reading and phonological processing within groups of either dyslexic or competent readers.
Nineteen dyslexic and 20 competently reading adults (18-64 years of age) participated. Participants completed 2 runs of a 2-alternative forced-choice saltation task, along with standard measures of reading and phonological processing.
Although overall poorer saltation thresholds were apparent in the dyslexic group, the threshold distributions overlapped considerably, with thresholds alone unable to predict group membership at a level significantly greater than chance. Neither strong nor significant correlations were observed among saltation thresholds, reading, and phonological processing skills within either group.
The results of this study do not support suggestions of impaired ATP in dyslexia or associations among ATP, reading, and phonological processing. However, it is proposed that increased within- and between-subject variability in auditory thresholds might be a more valuable marker of dyslexia than the thresholds themselves. Implications of this observation for dyslexia research are discussed.
在阅读障碍中，听觉跳跃错觉已被用作听觉时间加工（ATP）的一种测量方法，但结果却相互矛盾（参见R.哈里和P.基西拉，1996年；M.克龙比希勒、F.胡茨勒和H.维默，2002年）。本研究旨在通过调查阅读障碍是否以跳跃任务表现不佳为特征，以及跳跃阈值是否与阅读障碍组或阅读能力正常组内的阅读和语音加工相关，来重新审视这些发现。
19名阅读障碍成年人和20名阅读能力正常的成年人（年龄在18 - 64岁之间）参与了研究。参与者完成了两轮二选一的强制选择跳跃任务，以及阅读和语音加工的标准测量。
虽然阅读障碍组的总体跳跃阈值明显较差，但阈值分布有很大重叠，仅阈值无法在显著高于随机水平的程度上预测所属组别。在两组中，跳跃阈值、阅读和语音加工技能之间均未观察到强相关性或显著相关性。
本研究结果不支持阅读障碍中存在ATP受损或ATP、阅读和语音加工之间存在关联的观点。然而，有人提出，与阈值本身相比，听觉阈值在个体内和个体间变异性的增加可能是阅读障碍更有价值的标志。本文讨论了这一观察结果对阅读障碍研究的意义。
