Venkatagiri H S
J Commun Disord. 1982 Jan;15(1):55-62. doi: 10.1016/0021-9924(82)90044-2.
In an attempt to test the hypothesis that stuttering is the result of discoordination between phonation and articulation, 10 adult stutterers and 10 adult nonstutterers were asked to produce prolonged versions of /z/ and /s/ sounds, as quickly as possible, in response to tone stimuli. It was hypothesized that stutterers would exhibit significantly longer reaction time (RT) for the /z/, a voiced sound, than would a similar group of nonstutterers, whereas the two groups would not differ in RT for the /s/ sound, the unvoiced counterpart of /z/. The results showed that stutterers as a group did not differ from nonstutterers in RT for either the /z/ of the /s/ sound. However, it was found that severe stutterers exhibited significantly longer RTs for the /z/ sound than did mild stutterers. There were no differences between severe and mild stutterers in RT for the /s/ sound.
为了验证口吃是发声与发音不协调所致这一假设，研究人员要求10名成年口吃者和10名成年非口吃者，根据音调刺激尽可能快地发出/z/和/s/音的延长音。研究假设，对于/z/这个浊音，口吃者的反应时间（RT）会显著长于一组类似的非口吃者，而对于/s/这个/z/的清音对应音，两组在反应时间上不会有差异。结果显示，口吃者群体在/z/音或/s/音的反应时间上与非口吃者并无差异。然而，研究发现，严重口吃者发出/z/音的反应时间显著长于轻度口吃者。严重口吃者和轻度口吃者在/s/音的反应时间上没有差异。
