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Related Concept Videos

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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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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 brain processes sensory information rapidly due to parallel processing, which involves sending data across multiple neural pathways at the same time. This method allows the brain to manage various sensory qualities, such as shapes, colors, movements, and locations, all concurrently. For instance, when observing a forest landscape, the brain simultaneously processes the movement of leaves, the shapes of trees, the depth between them, and the various shades of green. This enables a quick and...
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Language is a system of communication that allows the expression of thoughts, ideas, and feelings. The brain processes language in both hemispheres.
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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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Each cerebral hemisphere can be divided into three main regions. The outermost region, the cerebral cortex, is a thin layer (2 to 4 millimeters thick) made up of gray matter, consisting of neuron cell bodies, dendrites, glial cells, and blood vessels. The middle region, or white matter, is primarily composed of myelinated nerve fibers organized into three types of large tracts: association fibers, commissures, and projection fibers. Association fibers connect different areas within the same...
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Evaluation of Hemisphere Lateralization with Bilateral Local Field Potential Recording in Secondary Motor Cortex of Mice
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Asymmetrical hemisphere activation enhances global-local processing.

Philip A Gable1, Bryan D Poole, Mary S Cook

  • 1The University of Alabama, United States.

Brain and Cognition
|October 23, 2013
PubMed
Summary
This summary is machine-generated.

This study shows that activating the left hemisphere enhances local processing, while activating the right hemisphere boosts global processing. Hand contractions were used to manipulate brain hemisphere activity and measure attentional scope.

Keywords:
AttentionGlobal–localHemisphere asymmetry

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Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Hemispheric Specialization

Background:

  • Extensive research links right hemisphere activity to global processing and left hemisphere activity to local processing of hierarchical stimuli.
  • Previous studies established correlations but lacked causal evidence for hemispheric contributions.

Purpose of the Study:

  • To investigate the causal role of hemisphere activation in global-local processing.
  • To determine if manipulating hemispheric activity can alter attentional scope and processing biases.

Main Methods:

  • Participants performed contralateral hand contractions to selectively activate brain hemispheres.
  • Electroencephalography (EEG) recorded brain activity, and attentional scope was measured.
  • N1 amplitudes in the left hemisphere were analyzed in relation to target stimuli.

Main Results:

  • Right-hand contractions led to increased relative left-cortical activity.
  • Left-hemisphere activation resulted in a narrower attentional scope compared to right-hemisphere activation.
  • Larger N1 amplitudes to local targets were observed in the left hemisphere following left-hemisphere activation.

Conclusions:

  • The findings provide causal evidence that manipulating left hemisphere activity enhances local attentional processing.
  • Conversely, manipulating right hemisphere activity appears to enhance global attentional processing.
  • This supports the established model of hemispheric asymmetry in attentional scope and processing.