Optical illusion

Optical illusion is a perception of visual stimuli that differs from reality. Optical illusions can be categorized into three main types: literal illusions, physiological illusions, and cognitive illusions.

Literal illusions

Literal illusions create images that are different from the objects that make them. These illusions are created by the physical properties of light, such as reflection, refraction, or interference.

Physiological illusions

Physiological illusions, such as the afterimage or moire pattern, are the effects on the eyes or brain of excessive stimulation of a specific type - brightness, color, size, position, tilt, movement, etc.

Cognitive illusions

Cognitive illusions are assumed to arise by interaction with assumptions about the world, leading to "unconscious inferences", an idea first suggested in the 19th century by the German physicist and physician Hermann von Helmholtz.

Gallery

• Checker shadow illusion
  Checker shadow illusion
• Grey square optical illusion proof
  Grey square optical illusion proof
• Gregory categorization of illusions 1991
  Gregory categorization of illusions 1991
• Mach bands animation
  Mach bands animation
• Neptune's Grotto Organ Player
  Neptune's Grotto Organ Player
• Two silhouette profile or a white vase
  Two silhouette profile or a white vase
• Duck-Rabbit illusion
  Duck-Rabbit illusion
• Error creating thumbnail:
  Kanizsa triangle
• Error creating thumbnail:
  Vertical–horizontal illusion
• Error creating thumbnail:
  Ponzo illusion
• Gradient optical illusion
  Gradient optical illusion

See also

• Visual perception
• Gestalt psychology
• Hermann von Helmholtz
• Afterimage
• Moire pattern

References

<references />

External links

• Michael Bach's 141 Optical Illusions & Visual Phenomena
• Optical Illusion Pictures and Illusion Art

This article is a medical stub. You can help WikiMD by expanding it!
Most recent articles Ongoing trials	Wikipedia

   This article is a medical stub. You can help WikiMD by expanding it!