Table 1.

Tasks and phonetic variability measures

Task and Number of Speakers	Transcription-based measures	Acoustic measures
64 item picture naming task (n=20)	Percent accuracy: sibilants and liquids Error Consistency Index	–
Rapid multisyllabic picture naming (n=18)	Total Token Variability (mean of 6 words)	Formants (F1 and F2): Euclidean distances from the mean (average over 8 target vowels) Word durations: Coefficient of variation (mean of 6 words)
Diadochokinetic task (n=16)	Number of different realizations of /pʌtʌkʌ/in 40 attempts	Coefficient of Variation of VOT and trisyllable durations