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Related Concept Videos

Neuroplasticity01:01

Neuroplasticity

Neuroplasticity reflects the brain's remarkable capacity to adapt and evolve, responding dynamically to learning, experiences, or injury by reorganizing its neural circuitry. This reorganization involves creating new neural connections and refining old ones through a series of biological processes that contribute to the brain's lifelong development and adaptability.

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Related Experiment Video

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Assaying Circuit Specific Regulation of Adult Hippocampal Neural Precursor Cells
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Brain State-Dependent Neocortico-Hippocampal Network Dynamics Are Modulated by Postnatal Stimuli.

Yoshiaki Shinohara1,2,3,4, Shinnosuke Koketsu5, Nobuhiko Ohno3,6

  • 1Department of Integrative Anatomy, Nagoya City University Graduate School of Medical Sciences, Nagoya 467-8601, Japan yoshinohara@yamanashi.ac.jp.

The Journal of Neuroscience : the Official Journal of the Society for Neuroscience
|January 27, 2025
PubMed
Summary
This summary is machine-generated.

Neocortical and hippocampal activity synchronize, with neocortical activity peaking around sharp wave ripples (SWRs) in specific brain regions. Postnatal environment influences these brain state dynamics.

Keywords:
calcium activitycortexhippocampuslocal field potentialssharp waves and ripplestheta oscillations

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Area of Science:

  • Neuroscience
  • Systems Neuroscience
  • Cognitive Neuroscience

Background:

  • Neuronal communication between the cerebral cortex and hippocampus is crucial for information transfer.
  • Previous research established temporal coordination but lacked insight into the spatial extent of neocortical involvement during hippocampal activity.
  • Understanding the relationship between neocortical spatial activity and hippocampal events is vital for deciphering brain function.

Purpose of the Study:

  • To investigate the spatial dynamics of neocortical activity in relation to hippocampal sharp wave ripples (SWRs) and theta oscillations.
  • To explore how different brain states (anesthetized, natural sleep, awake) and environmental conditions affect neocortico-hippocampal interactions.
  • To determine the role of postnatal experience in modulating these neural dynamics.

Main Methods:

  • Mesoscopic imaging of neocortical activity in GCaMP-expressing mice.
  • Simultaneous recording of hippocampal local field potentials.
  • Comparison of neural activity across different behavioral states and environmental rearing conditions (isolated vs. enriched).

Main Results:

  • Neocortical activity, particularly in visual and related areas, elevates around hippocampal SWRs.
  • Pre-SWR activity is common in awake and sleeping states, but post-SWR activity diminishes during natural sleep.
  • Urethane anesthesia induced SWR-correlated activity on a longer timescale; theta oscillations showed widespread, phase-locked neocortical activity.
  • Mice reared in isolation displayed more distinct brain state-dependent neocortico-hippocampal dynamics compared to those in enriched environments.

Conclusions:

  • The neocortex and hippocampus exhibit distinct, brain state-specific activity patterns.
  • Postnatal environmental experience significantly modulates the dynamics of neocortico-hippocampal communication.
  • These findings highlight the complex interplay between neural circuits, brain states, and environmental influences on brain function.