The development of tonal duration in Mandarin-speaking children

Developmental changes in suprasegmental tonal duration were investigated in monolingual Mandarin-speaking children. Tone durations were acoustically measured in five- and eight-year-old children and adults. Children's tone duration and variability decreased with age. Five-year-olds produced significantly longer tone durations than adults. Adult-like duration patterns existed in all children: Tone 4 was the shortest and tone 3 the longest. Duration differences between tones 2 and 3 became larger between five- and eight-year-olds. Results suggest a prolonged process of tone development beyond establishing phonological contrasts, which can be viewed as a hybrid of physiological production capacities and perceptual learning for maximal contrastivity.