@article{KuberskiGafos2021,
  author    = {Kuberski, Stephan R. and Gafos, Adamantios I.},
  title     = {Fitts' law in tongue movements of repetitive speech},
  series = {Phonetica : international journal of phonetic science},
  volume    = {78},
  journal   = {Phonetica : international journal of phonetic science},
  number    = {1},
  publisher = {De Gruyter Mouton},
  address   = {Berlin},
  issn      = {0031-8388},
  doi       = {10.1159/000501644},
  pages     = {3 -- 27},
  year      = {2021},
  abstract  = {Fitts' law, perhaps the most celebrated law of human motor control, expresses a relation between the kinematic property of speed and the non-kinematic, task-specific property of accuracy. We aimed to assess whether speech movements obey this law using a metronome-driven speech elicitation paradigm with a systematic speech rate control. Specifically, using the paradigm of repetitive speech, we recorded via electromagnetic articulometry speech movement data in sequences of the form /CV.../ from 6 adult speakers. These sequences were spoken at 8 distinct rates ranging from extremely slow to extremely fast. Our results demonstrate, first, that the present paradigm of extensive metronome-driven manipulations satisfies the crucial prerequisites for evaluating Fitts' law in a subset of our elicited rates. Second, we uncover for the first time in speech evidence for Fitts' law at the faster rates and specifically beyond a participant-specific critical rate. We find no evidence for Fitts' law at the slowest metronome rates. Finally, we discuss implications of these results for models of speech.},
  language  = {en}
}
@article{KuberskiGafos2019,
  author    = {Kuberski, Stephan R. and Gafos, Adamantios I.},
  title     = {The speed-curvature power law in tongue movements of repetitive speech},
  series = {PLoS one},
  volume    = {14},
  journal   = {PLoS one},
  number    = {3},
  publisher = {PLoS},
  address   = {San Fransisco},
  issn      = {1932-6203},
  doi       = {10.1371/journal.pone.0213851},
  pages     = {25},
  year      = {2019},
  abstract  = {The speed-curvature power law is a celebrated law of motor control expressing a relation between the kinematic property of speed and the geometric property of curvature. We aimed to assess whether speech movements obey this law just as movements from other domains do. We describe a metronome-driven speech elicitation paradigm designed to cover a wide range of speeds. We recorded via electromagnetic articulometry speech movements in sequences of the form /CV…/ from nine speakers (five German, four English) speaking at eight distinct rates. First, we demonstrate that the paradigm of metronome-driven manipulations results in speech movement data consistent with earlier reports on the kinematics of speech production. Second, analysis of our data in their full three-dimensions and using advanced numerical differentiation methods offers stronger evidence for the law than that reported in previous studies devoted to its assessment. Finally, we demonstrate the presence of a clear rate dependency of the power law's parameters. The robustness of the speed-curvature relation in our datasets lends further support to the hypothesis that the power law is a general feature of human movement. We place our results in the context of other work in movement control and consider implications for models of speech production.},
  language  = {en}
}