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Related Experiment Videos

A PET study of visuospatial attention

M Corbetta1, F M Miezin, G L Shulman

  • 1Department of Neurology and Neurological Surgery, Washington University School of Medicine, St. Louis, Missouri 63110.

The Journal of Neuroscience : the Official Journal of the Society for Neuroscience
|March 1, 1993
PubMed
Summary

This study used Positron Emission Tomography (PET) to reveal that the superior parietal and frontal cortex are key in shifting spatial attention. These brain regions help process visual stimuli in different visual fields.

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Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Medical Imaging

Background:

  • Shifting spatial attention is crucial for processing visual information.
  • Understanding the neural basis of attention shifting is essential for cognitive neuroscience.

Purpose of the Study:

  • To identify the neural systems involved in shifting spatial attention to visual stimuli.
  • To investigate the roles of superior parietal and frontal cortex in spatial attention.

Main Methods:

  • Positron Emission Tomography (PET) was employed to measure brain activity.
  • Psychophysical tasks were used to assess reaction times and attention cueing effects.

Main Results:

  • Superior parietal and superior frontal cortex showed increased activity during attention shifts to peripheral locations.

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  • These brain regions encoded the visual field (left vs. right) but not the direction of attention shift.
  • Distinct activity patterns in the right superior parietal lobe were observed for left and right visual field attention.

    • Conclusions:

    • Parietal and frontal regions play distinct roles in spatial selection.
    • The superior parietal cortex is involved in selecting peripheral locations based on cues, independent of response execution.
    • The frontal region is active when responses are made to selected peripheral stimuli.
    • Functional asymmetry in the superior parietal cortex may relate to unilateral neglect.