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Neural networks underlying endogenous and exogenous visual-spatial orienting.

Andrew R Mayer1, Jill M Dorflinger, Stephen M Rao

  • 1The MIND Institute, Suite 200, 801 University Boulevard, Albuquerque, NM 87106, USA. amayer@mind.unm.edu

Neuroimage
|October 19, 2004
PubMed
Summary

This study reveals distinct brain networks for internal (endogenous) and automatic (exogenous) attention orienting. Endogenous attention engages a broad cortical network, while inhibition of return (IOR) shows more localized activation.

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Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Visual Attention Research

Background:

  • Visual-spatial attention is crucial for survival, guided by external (exogenous) or internal (endogenous) cues.
  • Separate neural systems are hypothesized for exogenous and endogenous attention, but neuroimaging studies often show overlapping substrates.
  • Inhibition of return (IOR) is a phenomenon where recently attended locations are less likely to be re-attended.

Purpose of the Study:

  • To independently investigate the neural substrates of endogenous facilitation, exogenous facilitation, and IOR using event-related fMRI.
  • To contrast the distinct neural activations associated with internally driven versus externally triggered attention shifts.
  • To clarify the role of specific brain regions, like the temporoparietal junction, in different attentional processes.

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Main Methods:

  • Event-related functional magnetic resonance imaging (ER-FMRI) was employed to capture rapid neural responses.
  • Participants underwent fMRI scanning while performing tasks designed to elicit endogenous facilitation, exogenous facilitation, and IOR.
  • Analysis focused on identifying distinct patterns of cortical activation for each attentional component.

Main Results:

  • Endogenous facilitation led to widespread cortical activation, including the temporoparietal junction, superior temporal gyrus, middle temporal gyrus, frontal eye field, and intraparietal sulcus.
  • Exogenous facilitation and endogenous facilitation showed distinct, though partially overlapping, patterns of activation.
  • Inhibition of return (IOR) primarily activated the left superior temporal gyrus when compared to endogenous facilitation, suggesting a more specific neural correlate.

Conclusions:

  • Endogenous orienting recruits a large cortical network for internally driven attention shifts, contrasting with the automatic orienting of exogenous cues.
  • Similar neural networks may underlie both endogenous orienting and IOR, indicating potential shared mechanisms.
  • The temporoparietal junction appears involved in effortful processes like endogenous orienting, attentional reorienting, and target localization.