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Neural systems for visual orienting and their relationships to spatial working memory.

Maurizio Corbetta1, J Michelle Kincade, Gordon L Shulman

  • 1Campus Box 8111, Room 212A, Washington University School of Medicine, 4525 Scott Avenue, St. Louis, MO 63110-1093, USA. mau@npg.wustl.edu

Journal of Cognitive Neuroscience
|April 24, 2002
PubMed
Summary

This study reveals a dorsal network, including the intraparietal sulcus (IPs) and frontal eye field (FEF), controls voluntary attention. A separate right hemisphere network aids reorienting to unexpected sensory events.

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Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Neuroimaging

Background:

  • Visual orienting involves directing attention to specific locations.
  • Understanding the neural basis of attention allocation is crucial for cognitive neuroscience.

Purpose of the Study:

  • To investigate the neural correlates of human visual orienting.
  • To identify brain regions involved in the endogenous control and maintenance of visuospatial attention.
  • To explore networks involved in reorienting to sensory events.

Main Methods:

  • Event-related functional magnetic resonance imaging (fMRI) was employed.
  • Subjects performed tasks involving voluntary attention shifts and sustained attention.
  • Blood oxygen level dependent (BOLD) signals were analyzed to identify activated brain regions.

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Main Results:

  • A dorsal network comprising the intraparietal sulcus (IPs) and frontal eye field (FEF) showed robust, sustained activation during voluntary attention.
  • The ventral IPs and FEF specifically modulated the BOLD signal based on attention direction.
  • A separate right hemisphere network, including the temporo-parietal junction and inferior frontal gyrus, activated upon detecting targets at unattended locations.

Conclusions:

  • The IPs and FEF form a dorsal network critical for endogenous visuospatial attention allocation and maintenance.
  • A distinct right hemisphere network facilitates reorienting to salient sensory events, regardless of their location.
  • These findings elucidate the neural architecture supporting different attentional control mechanisms.