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Related Experiment Videos

Illusory dilatation of square surfaces

A Bazzeo, L Zanuttini

    Perception
    |January 1, 1978
    PubMed
    Summary

    Textured surfaces appear larger than plain white ones. Increasing dot density on surfaces can lead to an illusory expansion effect, up to a certain threshold.

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    Area of Science:

    • Visual perception
    • Psychophysics

    Background:

    • Illusory size perception is a complex phenomenon.
    • Surface texture can influence perceived object size.

    Purpose of the Study:

    • To investigate illusory surface dilatation.
    • To identify factors contributing to this visual illusion.
    • To quantify the effect of dot patterns on perceived surface area.

    Main Methods:

    • Preparation of square displays (8.5 cm x 8.5 cm) with varying black dot densities on a white background.
    • Presentation of stimuli to two groups using the method of paired comparisons and the method of limits (reduced viewing conditions).
    • Subjective evaluation of relative display magnitudes.

    Main Results:

    • Textured cards were perceived differently from the plain white standard and from each other.
    • A significant effect of dot density on perceived surface area was observed.
    • Surface expansion was noted as dot density increased, up to a specific threshold.

    Conclusions:

    • Surface texture, specifically dot pattern density, significantly influences perceived surface area.
    • The density of surface patterns can induce an illusory dilatation effect.
    • Further research is needed to fully understand the mechanisms of illusory size perception.

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