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Assessing Human Spatial Navigation in a Virtual Space and its Sensitivity to Exercise
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Load response functions in the human spatial working memory circuit during location memory updating.

Hoi-Chung Leung1, Hwamee Oh, Jamie Ferri

  • 1Department of Psychology, State University of New York at Stony Brook, Stony Brook, NY 11794-2500, USA. hoi-chung.leung@sunysb.edu <hoi-chung.leung@sunysb.edu>

Neuroimage
|January 24, 2007
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Summary

Updating spatial working memory involves similar brain regions for both maintenance and manipulation. The rostrodorsal premotor cortex and anterior inferior frontal gyrus are key for successful spatial tracking in working memory.

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Area of Science:

  • Cognitive Neuroscience
  • Neuroimaging
  • Human Brain Function

Background:

  • The dorsolateral prefrontal cortex is recognized for its role in working memory manipulation.
  • Frontal and parietal regions are commonly activated during working memory tasks.

Purpose of the Study:

  • To investigate brain responses during memory updating as a function of parametric load.
  • To identify brain regions sensitive to the manipulation of spatial information in working memory.

Main Methods:

  • Functional magnetic resonance imaging (fMRI) was employed.
  • A spatial delayed-response task with varying updating loads (3-12 cues) over a 9-second delay was used.
  • Parametric analysis of brain activity related to updating load was performed.

Main Results:

  • Activity increased with updating load in rostrodorsal premotor (rdPM), lateral precentral sulcus, lateral prefrontal, posterior associative, striatal, and cerebellar areas.
  • The rdPM and superior parietal cortex showed particular sensitivity to updating demands.
  • Updating and maintenance of spatial information engaged overlapping neural circuits, with linear load-dependent responses in many regions.

Conclusions:

  • Spatial working memory updating and maintenance share common neural processes.
  • The rostrodorsal premotor cortex and anterior inferior frontal gyrus are crucial for successful spatial information tracking in working memory.
  • Neural activity showed a linear relationship with updating load, plateauing at higher loads.