Age - Related Effects on the Production of Voice Onset Time in Thai Word
Jack Gandour · PASAA · 1990
Voice onset time (VOT) productions associated with three bilabial stops (/b p ph/), three alveolar stops (/d t th/), and two velar stops (/k kh/) were measured in 10 young and 10 old normal adults. Mean VOTs differed significantly as a function of age for /ph/ and /th/ only. Relative frequency distributions of VOT values showed no or minimal overlap for homorganic stop consonants in either age group. VOT variability did not differ significantly as a function of age. For both young and old speakers, voiceless unaspirated stops were less variable than either voiced or voiceless aspirated. Findings are compared to Sweeting and Baken's (1982) study of VOT in an English-speaking normal-aged population.