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Cortical systems mediating visual attention to both objects and spatial locations.

Sarah Shomstein1, Marlene Behrmann

  • 1Department of Psychology, Carnegie Mellon University and Center for the Neural Basis of Cognition, Pittsburgh, PA 15213, USA. shomstein@cmu.edu

Proceedings of the National Academy of Sciences of the United States of America
|July 15, 2006
PubMed
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Attention selects visual information via the posterior parietal cortex (PPC). The PPC prioritizes objects, influencing early brain regions to focus on attended items in complex scenes.

Area of Science:

  • Neuroscience
  • Cognitive Science
  • Visual Perception

Background:

  • Natural scenes contain numerous objects, creating competition for neural representation.
  • Attention is crucial for selecting relevant information from complex visual input.

Purpose of the Study:

  • To investigate the neural mechanisms underlying object-based attention.
  • To identify the brain regions mediating the selection of visual information.

Main Methods:

  • Event-related functional magnetic resonance imaging (fMRI) was employed.
  • Neural activity was measured during visual scene perception.

Main Results:

  • Posterior parietal cortex (PPC) activity mediated attentional selection.

Related Experiment Videos

  • PPC activation was sensitive to object-based properties, enhancing responses for attended objects.
  • Modulation of early cortical regions showed distinct temporal profiles for within-object versus between-object locations.

    • Conclusions:

    • Object-based selection is driven by an object-sensitive reorienting signal from the PPC.
    • A dynamic circuit between the PPC and sensory areas facilitates preferential attention to objects in complex scenes.