The relation of stuttering to mental fatigue.

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Abstract
The factual findings from these studies on the blocking tendency in normal and stuttering subjects are summarized as follows: (1) Stutterers block about twice as often as normal subjects in both vocal and manual responses. (2) The blocks of stutterers are significantly longer than those of normals in both types of performance. (3) The correlation between vocal and manual performance as to frequency and length of blocks is low. (4) The blocking of stutterers does not increase proportionately with fatigue as does that of normal subjects, at least for short working periods. (5) Stutterers with slow reaction time block more frequently and longer than those with quick reaction time. The theoretical significance of the findings is discussed. (PsycINFO Database Record (c) 2006 APA, all rights reserved)

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