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Related Experiment Videos

Maintaining and shifting attention within left or right hemifield.

R Vandenberghe1, J Duncan, K M Arnell

  • 1Laboratorium voor Neuroen Psychofysiologie, Katholieke Universiteit Leuven, Belgium. r-vandenberghe@nwu.edu

Cerebral Cortex (New York, N.Y. : 1991)
|July 25, 2000
PubMed
Summary

Brain imaging reveals that attention direction influences activity in occipital and left prefrontal areas. However, the parietal cortex does not show differential activation based on the frequency of attentional shifts.

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Area of Science:

  • Neuroscience
  • Cognitive Neuroscience

Background:

  • Visuospatial attention is crucial for processing environmental information.
  • Understanding the neural correlates of attention direction and shifting is key to cognitive neuroscience.

Purpose of the Study:

  • To investigate brain structure activity changes related to attention direction (left vs. right visual field).
  • To determine how parietal cortex activity is affected by the frequency of attentional shifts.

Main Methods:

  • Positron emission tomography (PET) was employed to measure brain activity.
  • Subjects performed a visual discrimination task with varying attentional demands (attended hemifield, shift frequency).

Main Results:

  • Occipital and lateral prefrontal areas showed increased blood flow contralateral to the attended hemifield.

Related Experiment Videos

  • Left lateral prefrontal cortex exhibited higher activity during leftward attention.
  • Parietal cortex showed activation but no differential response to high versus low attentional shift frequencies.

    • Conclusions:

    • Left frontal cortex is sensitive to the direction of visuospatial attention.
    • Parietal cortex does not appear to play a specific role in modulating attentional shifting frequency.