Katz J, Chertoff M, Sawusch J R
J Aud Res. 1984 Oct;24(4):251-64.
Children (aged 7-10 yrs) who were referred because of learning disabilities and found to have abnormal SSW scores were divided into Experimental and Control Groups. All had essentially normal pure-tone ac HTLs, tympanograms, and W-22 word discrimination scores. Pre-therapy baselines were also obtained on a speech-to-noise (S-in-N) task, a test of phonemic synthesis (PS) and a new procedure with staggered dichotic digits (SDD) patterned after the SSW. The therapy for the 5 Exper. Ss consisted of 15 lessons, given 1 hr each, 2 per week, using staggered dichotic digits [termed Digit Offset Therapy (DOT)]. The "competing" portion of the items ranged from complete overlap to 500-msec separation. The therapy program began with the most widely separated items first, followed by those with greater overlap in the succeeding lessons. Following DOT, the original test battery was readministered to both groups. During the therapy, significant improvement was noted for the Exper. Grp from Sessions 5 through 15 (less than .05 level) compared to the pre-therapy baseline. On the central tests, pre- and post-therapy, the Exper. Grp improved significantly over the Controls (.01 level) on the SDD test. There were also trends toward improvement for the Exper. Grp over the Controls on the SSW and S-in-N tests but neither reached statistical significance. Neither group improved in PS. Explanations for the test findings are discussed.
因学习障碍前来就诊且被发现SSW分数异常的7至10岁儿童被分为实验组和对照组。所有人的纯音听阈、鼓室图和W - 22单词辨别分数基本正常。还在言语噪声（S - in - N）任务、音素合成（PS）测试以及一项仿照SSW设计的交错双耳数字（SDD）新程序上获得了治疗前基线数据。5名实验组受试者的治疗包括15节课，每节课1小时，每周2节，采用交错双耳数字（称为数字偏移疗法（DOT））。项目的“竞争”部分范围从完全重叠到500毫秒间隔。治疗程序从间隔最宽的项目开始，随后在后续课程中使用重叠度更高的项目。DOT治疗后，对两组重新进行了原始测试组合。在治疗期间，与治疗前基线相比，实验组从第5节到第15节有显著改善（小于0.05水平）。在核心测试中，治疗前后，实验组在SDD测试上比对照组有显著改善（0.01水平）。在SSW和S - in - N测试中实验组也有比对照组改善的趋势，但均未达到统计学显著性。两组在PS测试中均未改善。文中讨论了测试结果的解释。
