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Related Concept Videos

Parallel Processing01:20

Parallel Processing

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The brain processes sensory information rapidly due to parallel processing, which involves sending data across multiple neural pathways at the same time. This method allows the brain to manage various sensory qualities, such as shapes, colors, movements, and locations, all concurrently. For instance, when observing a forest landscape, the brain simultaneously processes the movement of leaves, the shapes of trees, the depth between them, and the various shades of green. This enables a quick and...
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Vision is the result of light being detected and transduced into neural signals by the retina of the eye. This information is then further analyzed and interpreted by the brain. First, light enters the front of the eye and is focused by the cornea and lens onto the retina—a thin sheet of neural tissue lining the back of the eye. Because of refraction through the convex lens of the eye, images are projected onto the retina upside-down and reversed.
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Related Experiment Video

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Methods to Explore the Influence of Top-down Visual Processes on Motor Behavior
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Masking reveals parallel form systems in the visual brain.

Yu Tung Lo1, Semir Zeki1

  • 1Wellcome Laboratory of Neurobiology, Department of Cell and Developmental Biology, University College London London, UK.

Frontiers in Human Neuroscience
|August 15, 2014
PubMed
Summary

Complex visual form processing may involve parallel systems, not a single hierarchy. Rhombus perception is distinct from line and angle processing, suggesting separate visual pathways.

Keywords:
form perceptionhierarchical modelparallel processingvisual masking

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Area of Science:

  • Neuroscience
  • Visual Perception
  • Cognitive Psychology

Background:

  • The traditional view posits a single, hierarchical visual pathway for form processing.
  • Recent imaging studies suggest parallel processing for visual forms of varying complexity.

Purpose of the Study:

  • To investigate whether the brain processes visual forms through multiple parallel systems.
  • To test the hypothesis that complex forms are processed independently of simpler elements.

Main Methods:

  • A psychophysical backward masking technique was employed.
  • Subjects were presented with target-mask pairs of lines, angles, and rhombuses.
  • Masking effectiveness was analyzed to infer processing pathways.

Main Results:

  • Rhombuses showed strong masking by other rhombuses but weak masking by lines or angles.
  • Lines and angles effectively masked each other.
  • These findings indicate differential processing for complex and simple forms.

Conclusions:

  • Complex forms like rhombuses may be processed in a distinct parallel visual system.
  • Simpler forms like lines and angles appear to share a common processing pathway.
  • The visual system likely utilizes multiple parallel pathways for form perception.