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Related Concept Videos

Color Vision01:24

Color Vision

Color perception begins in the retina, the light-sensitive layer at the back of the eye. Two main theories explain how colors are seen: the trichromatic theory and the opponent-process theory. The trichromatic theory, proposed by Thomas Young in 1802 and extended by Hermann von Helmholtz in 1852, suggests that color vision is based on three types of cone receptors in the retina. These cones are sensitive to different but overlapping ranges of wavelengths corresponding to red, blue, and green.

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Orientation-specific aftereffects to mentally generated lines.

Harald M Mohr1, Nicolas S Linder, Hummel Dennis

  • 1Department of Biological Psychology, Institute for Psychology, Johann Wolfgang Goethe-University, Mertonstrasse 17, 60054 Frankfurt, Germany hmohr@em.uni-frankfurt.de

Perception
|June 23, 2011
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Summary
This summary is machine-generated.

Mental imagery, like imagining tilted lines, can create a direct tilt aftereffect (TAE), similar to visual perception. This suggests mental imagination utilizes visual perception resources, though in a distinct manner.

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Area of Science:

  • Cognitive Neuroscience
  • Visual Perception
  • Neuroscience

Background:

  • A direct tilt aftereffect (TAE) occurs when viewing tilted lines alters subsequent perception.
  • Previous fMRI studies suggest mental imagery, like imagining lines, can induce a direct TAE, implying perception-like coding in mental images.
  • Orientation-selective neurons in the extrastriate cortex are implicated in these effects.

Purpose of the Study:

  • To replicate and strengthen evidence for perception-like coding during orientation imagination.
  • To investigate whether mental imagery can induce indirect TAE and contrast-threshold elevation aftereffects.
  • To clarify the relationship between mental imagery and visual perception resource utilization.

Main Methods:

  • Replication of direct TAE induced by line imagination with design variations to control for perceptual confounds.
  • Attempting to induce indirect TAE and orientation-selective contrast-threshold elevation aftereffects via mental imagery.
  • Comparing effects of mental imagery with those of direct visual stimulation.

Main Results:

  • A robust direct TAE was consistently replicated through both mental imagery and visual stimulation.
  • No indirect TAE was induced by mental imagery; however, a perception bias in the opposite direction was observed.
  • Mental imagery of lines did not induce an orientation-selective contrast-threshold elevation aftereffect.

Conclusions:

  • Mental imagery significantly influences visual perception, indicating shared resource utilization.
  • While mental imagery uses perceptual resources, its utilization pattern differs from that of active visual perception.
  • The findings support the concept of perception-like coding in mental imagery, particularly for orientation-based aftereffects.