This report is one of a regular series about the status and progress of studies on the nature of speech, instrumentation for its investigation, and practical applications. The 17 papers discuss the identification of sine-wave analogues of speech sounds; prosodic information for vowel identity; progressive changes in articulatory patterns in verbal apraxia; temporal coordination of phonation and articulation in a case of verbal apraxia; factors in the maintenance and cessation of voicing; the influence of tempo on stop closure duration as a cue for voicing and place; reading reversals and developmental dyslexia; noncategorical perception of tone categories in Thai; effect of speaking rate on vowel formant movements; effects of transition length on identification and discrimination along a place continuum; perceptual integration and differentiation of spectral information across intervocalic stop closure intervals; musical skill and categorical perception of harmonic mode; phonetic and auditory aspects of adaptation; hemispheric specialization in children with language deficiency; source/tract coupling and vowel differences; vowel and consonant identification when cued by the same acoustic information; and information conveyed by vowels. (AA)