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Related Concept Videos

Parallel Processing01:20

Parallel Processing

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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Major Somatic Sensory Pathways

Sensory impulses related to touch, pressure, vibration, and proprioception from various body parts, such as the limbs, trunk, neck, and posterior head, travel to the cerebral cortex through the posterior column-medial lemniscus pathway. The pathway’s name derives from the two white-matter tracts that convey the impulses: the spinal cord's posterior column and the brainstem's medial lemniscus. First-order sensory neurons extend their axons into the spinal cord, forming the posterior columns...

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Methods to Explore the Influence of Top-down Visual Processes on Motor Behavior
09:49

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Published on: April 16, 2014

Challenges to normal neural functioning provide insights into separability of motion processing mechanisms.

Jutta Billino1, Doris I Braun, Frank Bremmer

  • 1Justus-Liebig-Universität, Gießen, Germany. jutta.billino@psychol.uni-giessen.de

Neuropsychologia
|August 3, 2011
PubMed
Summary

Ageing and brain lesions impact visual motion perception. Both first-order (luminance) and second-order (contrast) motion show similar age-related declines, suggesting overlapping neural resources. Lesion studies indicate shared higher-level processing pathways.

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Area of Science:

  • Neuroscience
  • Visual Perception
  • Cognitive Science

Background:

  • Distinguishing visual processing for different motion cues remains a challenge.
  • Neural correlates and network separability for motion perception are debated.
  • Understanding extrastriate processing changes is crucial for visual neuroscience.

Purpose of the Study:

  • To investigate the effects of ageing and extrastriate brain lesions on motion perception.
  • To differentiate processing of first-order (luminance-defined) and second-order (contrast-defined) motion.
  • To explore shared versus specialized neural substrates for motion cue processing.

Main Methods:

  • Assessed detection thresholds for first- and second-order motion in 102 subjects across an age range of 20-82 years.
  • Examined perceptual performance in 18 patients with focal cortical brain lesions.
  • Combined psychophysical testing with lesion analysis to map functional deficits.

Main Results:

  • Detection thresholds for both motion types significantly worsened with age, suggesting equivalent impact.
  • Ageing effects on first- and second-order motion perception indicate overlapping processing resources.
  • Lesion analysis revealed deficits in both motion types, supporting common higher cortical substrates, while specific substrates remain less clear.

Conclusions:

  • Ageing equally affects first- and second-order motion perception, supporting shared neural resources.
  • Evidence for functional specialization in early extrastriate areas is limited.
  • Higher cortical levels likely involve shared processing pathways for different motion cues.