Development of temporal patterning and vocal hesitations in spontaneous narratives

Narratives were told aloud by 12 boys and 12 girls at each of seven age levels in response to nine cartoon pictures. Speech rate increased with age, due to corresponding decreases in both legnth and frequency of unfilled pauses (UPs), although the two measures were themselves uncorrelated. Parenthetical remarks (PRs) increased with age, while repeats (Rs) decreased. Location of UPs (81% before function words) was stable over age levels. Comparisons with other experiments are made. Interrelationships of speaking and thinking are discussed in terms of the cognitive and linguistic functions of length and frequency of UPs, respectively. Theories that neglect multiple psychological determinants of speech behavior and/or concentrate on only one level or unit of encoding are rejected as inadequate.