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Knowledge in perception and illusion

R L Gregory1

  • 1Department of Psychology, University of Bristol, UK.

Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences
|August 29, 1997
PubMed
Summary
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Visual perception acts as an unconscious inference, akin to scientific hypotheses. Understanding visual illusions requires explaining their causes and appearances to differentiate past knowledge from present sensory input.

Area of Science:

  • Cognitive Science
  • Neuroscience
  • Philosophy of Mind

Background:

  • Visual perception is theorized as unconscious inference, integrating sensory data with past knowledge.
  • Advancements in science create discrepancies between perception and conception, complicating the definition of 'illusion'.
  • Visual illusions offer insights into object knowledge and visual processing rules when systematically explained.

Purpose of the Study:

  • To explore the nature of visual perception as an inferential process.
  • To address the challenges in defining visual illusions due to scientific progress.
  • To propose a classification system for visual illusions based on appearance and causal factors.

Main Methods:

  • Reviewing historical perspectives on visual perception, notably Helmholtz's theory.

Related Experiment Videos

  • Analyzing the relationship between scientific advancement and the perception-conception gap.
  • Developing a tentative classification framework for visual illusions.

    • Main Results:

    • Perceptions are presented as psychological projections of hypotheses, treated as immediate reality.
    • A classification of visual illusions is tentatively proposed, categorizing them by appearance and cause.
    • The study highlights the challenge of distinguishing present sensory input from past knowledge in vision.

    Conclusions:

    • Visual illusions are valuable for understanding vision but require classification and explanation.
    • The continuous influx of real-time sensory data, potentially marked by consciousness, helps differentiate the present from past influences.
    • Further research into the mechanisms distinguishing present perception from past knowledge is warranted.