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Related Concept Videos

Lateralization01:28

Lateralization

Brain lateralization refers to the division of mental processes and functions between the two hemispheres of the brain, a phenomenon that optimizes neural efficiency and underpins complex abilities in humans. This specialization allows each hemisphere to perform tasks where it has a comparative advantage, facilitating more refined cognitive capabilities across different domains.

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Brain activity during landmark and line bisection tasks.

Metehan Ciçek1, Leon Y Deouell, Robert T Knight

  • 1Department of Physiology, University of Ankara Turkiye. cicek@medicine.ankara.edu.tr

Frontiers in Human Neuroscience
|June 13, 2009
PubMed
Summary

Normal subjects show a right hemisphere bias in attention allocation, evidenced by line bisection tasks. Functional MRI (fMRI) identified right lateralized intra-parietal sulcus and peristriate cortex activity, crucial for attention.

Keywords:
fMRIlateralityline bisectionspatial attention

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Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Neuroimaging

Background:

  • Unilateral neglect patients exhibit rightward line bisection, suggesting right hemisphere involvement in attention.
  • Normal individuals typically display a leftward bias in line bisection, also indicating right hemisphere dominance for spatial attention.

Purpose of the Study:

  • To investigate the neural correlates of attention allocation in healthy subjects using functional magnetic resonance imaging (fMRI).
  • To identify brain regions engaged during line bisection tasks that are impaired in patients with unilateral neglect.

Main Methods:

  • Functional magnetic resonance imaging (fMRI) was employed in healthy participants.
  • Two tasks were utilized: a Landmark task (judging line bisection accuracy) and a line bisection task (active cursor placement).
  • Conjunction analysis of BOLD (Blood-Oxygen-Level-Dependent) signals from both tasks identified common active brain regions.

Main Results:

  • fMRI revealed significant right-lateralized activity in the intra-parietal sulcus and lateral peristriate cortex.
  • These right-hemisphere regions were consistently activated across both attention-demanding tasks.

Conclusions:

  • The findings support a predominantly right-hemisphere lateralized network for attention allocation in healthy individuals.
  • This right fronto-parietal network is critical for functions compromised in unilateral neglect, underscoring its importance in spatial attention.