Young M A
J Speech Hear Res. 1985 Jun;28(2):282-93. doi: 10.1044/jshr.2802.282.
Information about the conditions under which stuttering varies should include variables that both increase as well as decrease stuttering. Most investigations in which the research factors have been under experimental control have focused on decreasing rather than increasing stuttering. This literature review of conditions that might be expected to increase stuttering reveals that most investigators have not been able to raise stuttering frequency above control or base levels. Although some variables may increase stuttering, the research is too meager to speculate about underlying factors.
关于口吃在何种情况下会发生变化的信息应包括那些既能增加口吃又能减少口吃的变量。大多数研究因素处于实验控制之下的调查都集中在减少口吃而非增加口吃上。这篇关于可能会增加口吃的情况的文献综述表明，大多数研究者都未能将口吃频率提高到对照或基线水平之上。尽管一些变量可能会增加口吃，但相关研究过于匮乏，无法对潜在因素进行推测。
