Adherence to the two-thirds power law and kinematic differences in children with autism during ellipse drawing and tracing activities on smart-tablet

Emily Fourie, Szu-Ching Lu, Jonathan Delafield-Butt, Susan M. Rivera

Research output: Contribution to conferencePosterpeer-review

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Abstract

Autistic individuals often demonstrate atypical motor control of purposeful action1, especially in the area of fine motor skills. • Studies assessing writing and drawing reveal larger peak velocities and greater sizing variability in autistic participants.2 • During swiping gestures on a tablet, those with autism show atypical kinematics compared to typically-developing (TD) controls.3 • The emergence of these atypical kinematic features require further investigation. • One method used to characterize motor control is the two-thirds power law (⅔ PL), a law of motion involving a covariation between the velocity and curvature, in which velocity decreases in more curved parts and increases in less curved parts of movement, as specified by the equation: • Tangential Velocity = K * Radius of Curvature1/3 • The ⅔ PL governs many types of human movement, including of the arm4, foot5 and eyes.6 • It is present in early in development7 and the velocity-curvature coupling appears to progress with age.8 • The goal of this study is to assess adherence to the ⅔ PL and kinematic features during drawing movements in autistic and TD children ages 4 through 8. • The law has yet to be studied in autism. • It may offer insight into atypical motor development and provide a better metric by which to assess motor kinematics.
Original languageEnglish
Pages1
Publication statusPublished - 11 May 2022
EventAnnual Meeting of the International Society for Autism Research - Austin, United States
Duration: 11 May 202214 May 2022
https://www.autism-insar.org/general/custom.asp?page=2022AnnMtg

Conference

ConferenceAnnual Meeting of the International Society for Autism Research
Country/TerritoryUnited States
CityAustin
Period11/05/2214/05/22
Internet address

Keywords

  • austism
  • motor control
  • kinematics
  • power law

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