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Related Concept Videos

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The human brain, a complex organ, is functionally divided into two cerebral hemispheres—left and right. These hemispheres are interconnected by a structure of paramount importance, the corpus callosum. This substantial bundle of neural fibers is not just a bridge between the hemispheres but a crucial element for the brain's comprehensive functioning. It enables efficient communication between the two hemispheres, allowing each side of the brain to control and receive sensory and motor...
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The cerebral cortex, a critical structure of the brain, is intricately divided into two hemispheres, each consisting of four distinct lobes: occipital, temporal, frontal, and parietal. These lobes function cooperatively to regulate various cognitive and sensory functions, forming the basis of our complex neural capabilities.
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Related Experiment Video

Updated: Apr 5, 2026

Central and Divided Visual Field Presentation of Emotional Images to Measure Hemispheric Differences in Motivated Attention
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Spatial distribution of attention and inter-hemispheric competition.

Kao Yamaoka1, Chikashi Michimata2

  • 1Department of Psychology, Sophia University, Tokyo, Japan. k-yamaok@sophia.ac.jp.

Cognitive Processing
|August 21, 2015
PubMed
Summary

Spatial attention differs between brain hemispheres. A salient cue in the right visual field speeds up left-sided target detection, suggesting hemispheric activation influences attention distribution and competition.

Keywords:
Attentional distributionHemispheric asymmetryInter-hemispheric competitionSalient singletonSpatial attentionVisual extinction

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Area of Science:

  • Cognitive Neuroscience
  • Neuroscience
  • Psychology

Background:

  • Functional asymmetry exists in spatial attention between the left and right cerebral hemispheres.
  • Theoretical models of spatial attention need further examination regarding distribution and inter-hemispheric competition.

Purpose of the Study:

  • To investigate theoretical models of spatial attention.
  • To examine attentional distribution and inter-hemispheric competition in healthy individuals.
  • To determine how hemispheric activation influences spatial attention.

Main Methods:

  • Participants searched for a green circle target among green diamond non-targets.
  • A salient red singleton cue was presented in either the left or right visual field.
  • Target visual fields were manipulated in relation to the singleton's visual field.

Main Results:

  • When the singleton was in the right visual field, left visual field targets were detected faster than right visual field targets.
  • When the singleton was in the left visual field, target detection times were similar for both visual fields.
  • Hemispheric activation by a salient cue modulated attentional distribution.

Conclusions:

  • Perceptually salient stimuli activate specific cerebral hemispheres, influencing attentional distribution.
  • Inter-hemispheric competition plays a role in how attention is allocated.
  • Findings support Kinsbourne's opponent processor theory of attention.