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A note on illusions.

S H Bartley

    Perceptual and Motor Skills
    |February 1, 1975
    PubMed
    Summary

    Illusion arises not from perception, but from assuming 2D drawings depict 2D reality. This incorrect assumption can lead to flawed comparisons within visual figures.

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    Area of Science:

    • Visual perception research
    • Cognitive psychology
    • Art and design theory

    Background:

    • Illusions often studied through perceptual mechanisms.
    • The role of assumptions in visual interpretation is complex.
    • Two-dimensional representations are ubiquitous in communication and art.

    Purpose of the Study:

    • To identify the primary cognitive factor underlying visual illusions.
    • To challenge the solely perception-based explanations of illusions.
    • To explore the impact of representational assumptions on visual interpretation.

    Main Methods:

    • Analysis of cognitive assumptions in visual processing.
    • Theoretical examination of the relationship between 2D drawings and perceived reality.
    • Case studies of specific visual illusions and their interpretation.

    Main Results:

    • The core of illusion lies in the assumption that 2D drawings equate to 2D reality.
    • This assumption can lead to invalid comparisons between figure elements.
    • Perceptual processes are secondary to these representational assumptions.

    Conclusions:

    • Understanding visual illusions requires addressing representational assumptions.
    • The interpretation of 2D figures is heavily influenced by implicit beliefs about their dimensionality.
    • Future research should focus on the cognitive underpinnings of representational assumptions in visual illusions.

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