This report is one of a regular series on the status and progress of studies on the nature of speech, instrumentation for its investigation, and practical applications. "Preliminaries to a Theory of Action with Reference to Vision" attempts to describe how the contents of vision may relate to the process of action. "On the Relationship of Speech…

Several experiments that manipulate stuttering by the use of delayed auditory feedback (DAF) and the prolongation of speech are reported. In a study on six severe stutterers (aged 15 to 47), self monitoring as a source of reinforcement in the use of DAF reduced stuttering frequency. Stuttering frequency was investigated with six severe stutterers…