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. The ten papers treat the following topics: speech synthesis as a tool for the study of speech production; the study of articulatory organization; phonetic perception; cardiac indices of infant speech perception; cinefluorographic and electromyographic studies of articulatory organization; stimulus dominance and ear dominance in the perception of dichotic voicing contrasts; voicing-conditioned durational differences in vowels and consonants in the speech of three- and four-year-old children; electromyography signal processing for speech research; perceptual test of a phonological rule; and adaptation of the category boundary between speech and nonspeech. A cumulative index to papers in previous collections and document numbers for previous collections are included. (AA)