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Modeling the Functional Network for Spatial Navigation in the Human Brain
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Categorical and coordinate spatial relations in working memory: an fMRI study.

Ineke J M van der Ham1, Mathijs Raemaekers, Richard J A van Wezel

  • 1Helmholtz Institute, Experimental Psychology, Utrecht University, Utrecht, The Netherlands. c.j.m.vanderham@uu.nl

Brain Research
|August 5, 2009
PubMed
Summary

This study found that spatial relation processing shows hemispheric specialization in the superior parietal cortex, particularly with short time intervals. Brain activity differs for coordinate versus categorical spatial tasks.

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Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Neuroimaging

Background:

  • Spatial relations are processed coordinately (metric) or categorically (qualitative).
  • Previous research suggests right parietal cortex for coordinate and left for categorical processing.
  • Hemispheric lateralization of spatial relation processing requires further investigation within working memory.

Purpose of the Study:

  • To examine hemispheric lateralization of spatial relation processing using functional magnetic resonance imaging (fMRI).
  • To investigate the influence of temporal constraints (short vs. long intervals) on this lateralization.
  • To differentiate neural activity associated with coordinate versus categorical spatial judgments.

Main Methods:

  • Functional magnetic resonance imaging (fMRI) experiment.

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  • Visual half-field task in a match-to-sample format.
  • Manipulated interval duration (500 ms vs. 2000 ms) and instruction type (categorical vs. coordinate).

    • Main Results:

    • Behavioral data supported hemispheric specialization for brief intervals.
    • fMRI data confirmed lateralization within the superior parietal cortex, dependent on temporal constraints.
    • Categorical trials (brief interval) involved premotor and posterior parietal areas.
    • Coordinate trials (long interval) showed increased activity in the insula.

    Conclusions:

    • Spatial relation processing exhibits hemispheric lateralization within the superior parietal cortex.
    • Temporal constraints significantly modulate this lateralization effect.
    • Distinct neural networks support categorical and coordinate spatial processing, influenced by time intervals.