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Visual assessment of causality in the Poisson effect.

Takahiro Kawabe1

  • 1NTT Communication Science Laboratories, Atsugi, Japan. takkawabe@gmail.com.

Scientific Reports
|October 20, 2019
PubMed
Summary

Human perception of the Poisson effect, where stretching causes compression, doesn't rely on physical properties like Poisson's ratio. Instead, observers use visual cues related to deformation magnitude for causality assessment.

Area of Science:

  • Psychology
  • Physics
  • Perception Science

Background:

  • The Poisson effect describes the causal relationship between stretching a material along one axis and its compression along the orthogonal axis.
  • Understanding how humans perceive this physical phenomenon is crucial for fields ranging from material science to human-computer interaction.

Purpose of the Study:

  • To investigate the perceptual cues and heuristics human observers utilize when assessing causality in the Poisson effect.
  • To determine if physical properties, such as Poisson's ratio, influence the perceived causality of material deformation.

Main Methods:

  • Participants viewed video stimuli of a rectangular region undergoing horizontal stretching and vertical compression.
  • The magnitude of vertical compression was modulated sinusoidally.

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  • Observers reported their perception of causality for the observed deformations.

    • Main Results:

    • The physical index of the Poisson effect, Poisson's ratio, did not correlate with the degree of reported causality.
    • Perceived causality was significantly explained by image features related to the magnitude of deformation.
    • Causality assessment did not consistently require comparing the material's shape before and after deformation.

    Conclusions:

    • Human observers do not rely on the physical definition of Poisson's ratio to assess causality in material deformation.
    • Perceptual heuristics based on readily available image features, particularly deformation magnitudes, guide the assessment of Poisson effect causality.
    • This suggests a dissociation between the physical properties of a material and human perceptual judgments of its behavior.