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A parcellation scheme for human left lateral parietal cortex.

Steven M Nelson1, Alexander L Cohen, Jonathan D Power

  • 1Department of Neurology, Washington University, St. Louis, MO 63110, USA. stevenelson@wustl.edu

Neuron
|July 14, 2010
PubMed
Summary
This summary is machine-generated.

Researchers have mapped the left lateral parietal cortex (LLPC) into six distinct regions. This new parcellation scheme aids understanding of the LLPC's role in memory retrieval and recognition.

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Area of Science:

  • Neuroscience
  • Cognitive Neuroscience
  • Neuroimaging

Background:

  • The parietal lobe is traditionally seen as having architectonic and functional subdivisions.
  • Previous research emphasized visuospatial attention and control, but recent studies highlight the left lateral parietal cortex (LLPC) in memory retrieval.
  • Increased LLPC activity correlates with correct identification of previously studied items during recognition memory tasks.

Purpose of the Study:

  • To define distinct functional regions within the LLPC.
  • To develop a novel parcellation scheme for the LLPC.
  • To provide a framework for future research on LLPC function in memory.

Main Methods:

  • Integration of resting-state functional connectivity MRI and functional MRI data.
  • Development of a parcellation scheme based on memory-retrieval activity.
  • Analysis of task-evoked time courses and large-scale brain network membership.

Main Results:

  • A 6-fold parcellation of the LLPC was established.
  • The parcellation identified regions based on memory retrieval engagement.
  • Dissociations in task-evoked activity profiles and network affiliations were observed.

Conclusions:

  • The developed parcellation scheme offers a refined view of LLPC functional organization.
  • This map differentiates regions involved in memory retrieval processes.
  • The study provides a roadmap for future investigations into LLPC's role in recognition memory.