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Related Experiment Videos

Invariant properties between stroke features in handwriting

H L Teulings1, L R Schomaker

  • 1Nijmegen Institute for Cognition and Information (NICI), University of Nijmegen, The Netherlands.

Acta Psychologica
|March 1, 1993
PubMed
Summary
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Handwriting analysis reveals a hierarchy of motor control, with vertical stroke size being a more invariant, higher-level parameter than stroke duration or force. This suggests reliable stroke segmentation in handwriting movements.

Area of Science:

  • Motor Control
  • Human Factors
  • Biomechanical Engineering

Background:

  • Handwriting patterns are viewed as sequences of ballistic strokes originating from a central motor program.
  • Invariance in stroke features suggests a hierarchical representation, with invariant features linked to higher-level parameters and variable features to lower-level parameters.

Purpose of the Study:

  • To investigate the hierarchical structure of handwriting invariances.
  • To determine the relationship between different stroke features and their invariance levels.
  • To confirm the top-down hierarchy of motor control in handwriting.

Main Methods:

  • Analysis of signal-to-noise ratio (SNR), between-parameter correlations, and between-condition correlations.
  • Examination of between-stroke correlations and rescalability.

Related Experiment Videos

  • Separate analysis of upstrokes and downstrokes.

    • Main Results:

    • Vertical stroke size demonstrated higher SNRs and between-condition correlations than stroke duration or peak force.
    • Downstrokes exhibited greater invariance in vertical stroke size compared to upstrokes.
    • While vertical and horizontal sizes showed between-stroke correlations, stroke durations did not, indicating reliable stroke segmentation.

    Conclusions:

    • The study largely confirms a top-down hierarchy in handwriting motor control.
    • Vertical stroke size is a higher-level parameter than stroke duration and peak force.
    • Despite discrete sampling, stroke segmentation in handwriting is reliable.