Age-related lip movement repetition variability in two phrase positions
Johan Frid, Susanne Schötz, Anders Löfqvist · Lund University Publications (Lund University) · 2011
This study examined the relationship between age and lip movement variability across repetitions of an utterance.We applied functional data analysis (FDA) to lip movement data of 15-20 repetitions of a short Swedish phrase from 37 Swedish speakers (19 females, 18 males, 5-31 years) collected with three-dimensional articulography.From each utterance, three different sub-units were extracted semiautomatically by locating consistent kinetic events in the lip movement functions.Results generally showed moderate negative correlations between age and amplitude variability.The longest possible sub-unit, given consistent kinematic events, showed the strongest correlation.