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Major Somatic Sensory Pathways01:28

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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Updated: May 8, 2026

Translational Brain Mapping at the University of Rochester Medical Center: Preserving the Mind Through Personalized Brain Mapping
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The Interaction of Spatial and Object Pathways: Evidence from Balint's Syndrome.

L Robertson1, A Treisman, S Friedman-Hill

  • 1Veterans Administration and University of California, Davis.

Journal of Cognitive Neuroscience
|August 23, 2013
PubMed
Summary
This summary is machine-generated.

Patient RM with parietal damage has significant binding issues, impacting object individuation and visual search. Explicit spatial knowledge is crucial for feature binding, attention, and search accuracy.

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Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Visual Perception

Background:

  • Bilateral parietal damage can cause severe visual binding deficits, as seen in patient RM.
  • These deficits align with Treisman's Feature Integration Theory (FIT), suggesting a loss of spatial information impairs binding.
  • Previous findings indicated problems with illusory conjunctions, object localization, and simultanagnosia.

Purpose of the Study:

  • To investigate further deficits in patient RM predicted by Feature Integration Theory (FIT).
  • To examine the role of explicit spatial knowledge in feature binding, attentional selection, and visual search.
  • To determine if parietal damage affects object perception beyond spatial and attentional deficits.

Main Methods:

  • Assessed object individuation by having RM count objects.
  • Evaluated visual search performance for targets defined by unique features versus feature conjunctions.
  • Tested search for feature absence versus feature presence.
  • Compared binding errors in simultaneous versus sequential visual presentations.
  • Examined attentional selection based on spatial markers and features like color.

Main Results:

  • RM exhibited impaired object individuation, unable to accurately count more than a few objects.
  • Visual search for feature conjunctions was impaired, while search for unique features was intact.
  • Search for feature absence was severely impaired, unlike search for feature presence.
  • Binding errors were more frequent with simultaneous than sequential presentation, highlighting the role of spatial information.
  • Attentional selection was significantly impaired, regardless of the selection cue (spatial or feature-based).

Conclusions:

  • Explicit spatial knowledge is essential for accurate feature binding, attentional selection, and visual search.
  • Parietal damage impacts object perception by disrupting spatial representations crucial for spatial awareness.
  • The functional consequences of parietal damage extend beyond spatial and attentional deficits to affect object individuation and feature integration.