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Related Experiment Video

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Optogenetic Entrainment of Hippocampal Theta Oscillations in Behaving Mice
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Pyramidal cell-interneuron interactions underlie hippocampal ripple oscillations.

Eran Stark1, Lisa Roux1, Ronny Eichler1

  • 1NYU Neuroscience Institute, School of Medicine, New York University, New York, NY 10016, USA.

Neuron
|July 18, 2014
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Summary

High-frequency brain oscillations in the hippocampus, crucial for memory, are generated by precise local neural interactions. Optogenetics revealed that activating pyramidal cells induces ripples, while inhibiting them or specific interneurons stops them.

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Area of Science:

  • Neuroscience
  • Systems Neuroscience
  • Computational Neuroscience

Background:

  • High-frequency ripple oscillations in the hippocampal CA1 region are linked to memory consolidation.
  • The precise cellular and network mechanisms governing ripple generation, frequency control, and spatial coherence remain unclear.

Purpose of the Study:

  • To elucidate the cellular and network mechanisms underlying hippocampal ripple generation and control.
  • To differentiate between competing models of ripple generation using in vivo manipulations.

Main Methods:

  • Multisite optogenetic manipulations in freely behaving rodents.
  • Closed-loop silencing of pyramidal cells and activation of specific interneuron subtypes (parvalbumin- and somatostatin-immunoreactive).
  • Pharmacological blockade of GABAA receptors and localized interneuron activation.

Main Results:

  • Depolarization of a small group of pyramidal cells induced high-frequency oscillations.
  • Silencing pyramidal cells or activating PV/SST interneurons aborted spontaneous ripples.
  • GABAA receptor blockade abolished ripples; PV interneuron activation paced ensemble spiking.
  • Simultaneous ripple induction at multiple sites created temporally coherent patterns via phase-locked interneuron activity.

Conclusions:

  • Temporally precise local interactions between excitatory and inhibitory neurons are essential for ripple generation in the hippocampus.
  • Findings constrain existing models of ripple generation and highlight the role of interneuron network dynamics.