Powell T W, Elbert M
J Speech Hear Disord. 1984 May;49(2):211-8. doi: 10.1044/jshd.4902.218.
Three pairs of matched subjects, ages 4:4 to 6:3 (yrs:mos), who consistently misarticulated word-initial consonant clusters were taught to produce either earlier-developing (stop + liquid) clusters or later-developing (fricative + liquid) clusters. Sixty untrained probe items were administered imitatively during baseline and periodically throughout treatment to assess articulation change over time. Five of the six subjects performed with essentially equal accuracy on both cluster categories during the final probe administration regardless of the nature of their treatment. Additional analysis revealed the liquid segment [( r] or [l]) as the apparently decisive factor in four subjects' learning patterns.
三对年龄在4岁4个月至6岁3个月之间的匹配受试者，他们始终存在词首辅音连缀发音错误，被教导发出较早发展的（塞音+流音）连缀或较晚发展的（擦音+流音）连缀。在基线期模仿性地呈现60个未经训练的探测项目，并在整个治疗过程中定期进行，以评估发音随时间的变化。在最后一次探测时，六名受试者中有五名在两种连缀类别上的表现基本相同，无论他们接受的治疗性质如何。进一步分析发现，流音部分（[r]或[l]）是四名受试者学习模式中明显的决定性因素。
