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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.
Cerebral Hemispheres01:05

Cerebral Hemispheres

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...
Role of Hippocampus in Memory01:19

Role of Hippocampus in Memory

The hippocampus, a critical brain structure, plays an essential role in memory processing, particularly in the formation and retrieval of memory. This small, seahorse-shaped region is located within the medial temporal lobe, with one hippocampus in each brain hemisphere. Experimental studies involving lesions in the hippocampi of rats have demonstrated significant impairments in tasks such as object recognition and maze navigation, indicating the hippocampus involvement in both recognition and...

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Related Experiment Video

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Evaluation of Hemisphere Lateralization with Bilateral Local Field Potential Recording in Secondary Motor Cortex of Mice
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Published on: July 31, 2019

Right-hemispheric dominance of spatial memory in split-brain mice.

Yoshiaki Shinohara1, Aki Hosoya, Nobuyuki Yamasaki

  • 1Division of Cerebral Structure, National Institute for Physiological Sciences, Myodaiji, Okazaki, Aichi, Japan. shinohara@brain.riken.jp

Hippocampus
|November 12, 2010
PubMed
Summary

The right hippocampus enhances spatial memory accuracy in mice, while both hemispheres support spatial learning. Non-spatial memory tasks show no difference based on hippocampal laterality.

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Published on: February 26, 2012

Area of Science:

  • Neuroscience
  • Cognitive Neuroscience
  • Neurobiology

Background:

  • Left-right brain asymmetry is a known phenomenon, but its molecular and cellular underpinnings, particularly in the hippocampus, remain unclear.
  • Recent research indicates asymmetrical arrangement of hippocampal CA3-CA1 excitatory synapses, yet functional implications at the behavioral level are unexplored.

Purpose of the Study:

  • To investigate the behavioral consequences of left-right hippocampal asymmetry in spatial memory using a "split-brain" mouse model.
  • To determine if hippocampal laterality influences performance in spatial versus non-spatial hippocampus-dependent tasks.

Main Methods:

  • "Split-brain" mice underwent surgical transection of the ventral hippocampal commissure and corpus callosum, coupled with monocular visual deprivation.
  • Behavioral analysis was conducted using the Barnes maze and a two-choice spatial maze to assess spatial learning and memory accuracy.
  • Performance on non-spatial, hippocampus-dependent tasks like fear conditioning was also evaluated.

Main Results:

  • Mice forced to rely on the right hippocampus demonstrated superior performance in the Barnes maze compared to those using the left hippocampus.
  • In a two-choice spatial maze, both left and right hippocampal usage yielded comparable spatial learning abilities.
  • Laterality of hippocampal function did not affect performance in non-spatial tasks such as fear conditioning.

Conclusions:

  • The right hippocampus appears to improve the accuracy of spatial memory formation.
  • While both hippocampal hemispheres can perform spatial learning, the right side may offer an advantage in spatial memory precision.
  • Hippocampal laterality does not influence the performance of non-spatial hippocampus-dependent memory tasks.