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Related Experiment Video

Updated: Mar 27, 2026

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Quantifying Repetitive Hand Flapping Kinematics in Autistic and Non-Autistic Toddlers Using Video-Based Pose

Jan Stenum1, Elizabeth Eiler2, Ryan T Roemmich1,3

  • 1Department of Physical Medicine and Rehabilitation, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA.

Developmental Science
|March 26, 2026
PubMed
Summary
This summary is machine-generated.

Autistic toddlers showed greater amplitude in repetitive hand flapping compared to non-autistic toddlers, but frequency did not differ. Analyzing individual flapping events, rather than averages, revealed these kinematic differences in early development.

Keywords:
autismearly identificationkinematicspose estimationrepetitive behaviors

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Area of Science:

  • Developmental psychology
  • Biomechanical analysis
  • Artificial intelligence in healthcare

Background:

  • Repetitive behaviors like hand flapping are common in autism spectrum disorder (ASD).
  • Distinguishing clinically meaningful differences in hand flapping between autistic and non-autistic toddlers before age 2 is challenging.
  • Subtle movement variations may be detectable using advanced technology.

Purpose of the Study:

  • To investigate kinematic differences in repetitive hand flapping between autistic and non-autistic toddlers.
  • To determine if amplitude and frequency of hand flapping differ between groups.
  • To explore the utility of computer vision in identifying early behavioral markers.

Main Methods:

  • Utilized AlphaPose, an AI-powered computer vision tool, to analyze video recordings of toddlers during a bubble play activity.
  • Quantified the amplitude and frequency of repetitive hand flapping from manually annotated video segments.
  • Compared kinematic data between 14 toddlers with ASD and 14 without ASD, aged 13-16 months.

Main Results:

  • Event-level analysis revealed significantly greater amplitude of hand flapping in autistic toddlers compared to non-autistic toddlers (p = 0.028).
  • No significant differences in the frequency of hand flapping were found between groups (p = 0.464).
  • Event-averaged analyses masked these amplitude differences, indicating variability in findings based on analytical approach.

Conclusions:

  • Event-level analysis of repetitive hand flapping amplitude may offer a more sensitive method for identifying early kinematic differences in toddlers.
  • The findings highlight the importance of fine-grained analysis to understand subtle behavioral variations in early development.
  • Computer vision techniques show promise for objective assessment of early developmental behaviors.