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Related Experiment Videos

Handgrip maximum force and the visual horizontal-vertical illusion.

Jaanus Raudsepp1, Mats Djupsjöbacka

  • 1Centre for Musculoskeletal Research, University of Gävle, PO Box 7629, SE 907 12 Umeå, Sweden. jaanus.raudsepp@hig.se

Perception
|June 10, 2005
PubMed
Summary

People with greater handgrip strength perceive vertical lines as shorter, supporting the effort-based theory of the visual horizontal-vertical illusion (HVI). This finding extends previous research on 3-D objects to 2-D stimuli.

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Area of Science:

  • * Visual perception
  • * Human psychophysics
  • * Embodied cognition

Background:

  • * The horizontal-vertical illusion (HVI) causes overestimation of vertical compared to horizontal distances.
  • * Existing theories do not fully explain the HVI across diverse stimuli.
  • * The 'effort' account suggests HVI relates to perceived gravitational challenges and physical effort.

Purpose of the Study:

  • * To investigate if the HVI's dependence on physical strength extends to 2-D stimuli.
  • * To test the 'effort' account of HVI using small-scale line stimuli.
  • * To explore the relationship between handgrip strength and HVI magnitude and variability.

Main Methods:

  • * Measured maximum handgrip strength in 32 participants.
  • * Assessed the horizontal-vertical illusion using a computerized line-adjustment task.

Related Experiment Videos

  • * Analyzed correlations between grip strength and HVI measures.

    • Main Results:

    • * A significant negative correlation was found between dominant hand strength and HVI magnitude.
    • * Grip strength of both hands negatively correlated with HVI variability.
    • * Findings align with previous studies on large-scale 3-D objects.

    Conclusions:

    • * The HVI's relationship with physical strength is not limited to large-scale 3-D environments.
    • * Results support the 'effort' account, linking visual perception to physical capabilities.
    • * Individual differences in physical strength may influence the magnitude and consistency of the HVI.