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Related Experiment Videos

Interactions between ego- and allocentric neuronal representations of space.

S F W Neggers1, R H J Van der Lubbe, N F Ramsey

  • 1Department of Psychonomics, Helmholtz Institute, University of Utrecht, Heidelberglaan 2, 3584 CS Utrecht, The Netherlands. B.Neggers@fss.uu.nl

Neuroimage
|February 14, 2006
PubMed
Summary

The superior parietal lobule (SPL) supports egocentric spatial judgments for action, unaffected by background cues. Occipito-temporal areas show biases, influencing cognitive reports of location.

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Area of Science:

  • Neuroscience
  • Cognitive Neuroscience
  • Spatial Cognition

Background:

  • The primate brain distinguishes egocentric (body-referenced) and allocentric (object-referenced) spatial representations.
  • These representations are interdependent, with background frames biasing egocentric judgments, but not necessarily motor actions.
  • Current theories propose dorsal parietal areas for visuomotor control and temporal areas for memory/cognition.

Purpose of the Study:

  • To investigate whether egocentric spatial representations in the parietal cortex are immune to irrelevant allocentric background cues.
  • To differentiate the neural correlates of egocentric versus allocentric spatial judgments.
  • To test the hypothesis that parietal egocentric representations for movement are not influenced by irrelevant allocentric information.

Main Methods:

Related Experiment Videos

  • An event-related functional magnetic resonance imaging (fMRI) study was conducted.
  • Participants performed egocentric (body-referenced) and allocentric (background-referenced) spatial judgment tasks.
  • Brain activity was analyzed, focusing on the superior parietal lobule (SPL) and superior temporal gyrus (STG), and the influence of irrelevant background cues was assessed.

Main Results:

  • Superior parietal lobule (SPL) activity increased during egocentric judgments but not allocentric ones.
  • Superior temporal gyrus (STG) showed a negative BOLD response during allocentric judgments and no activation during egocentric judgments.
  • Irrelevant background cues influenced activity in occipito-temporal areas during egocentric judgments, leading to biased cognitive reports, but did not affect SPL activity.

Conclusions:

  • Parietal egocentric representations, crucial for goal-directed actions, are not influenced by irrelevant allocentric background information.
  • Occipito-temporal areas are sensitive to spatial perceptual biases, affecting cognitive reports of location.
  • This suggests a dissociation between neural systems supporting unbiased motor control and biased cognitive perception.