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Immunohistochemical Visualization of Hippocampal Neuron Activity After Spatial Learning in a Mouse Model of Neurodevelopmental Disorders
Published on: May 12, 2015
Hippocampal network patterns of activity in the mouse
G Buzsáki1, D L Buhl, K D Harris
1Center for Molecular and Behavioral Neuroscience, Rutgers, The State University of New Jersey, 197 University Avenue, Newark, NJ 07102, USA. buzsaki@axon.rutgers.edu
Neuroscience
|January 22, 2003
Summary
This study mapped mouse hippocampus electrical activity, revealing theta and gamma oscillations during exploration and sleep. These patterns, including sharp waves and ripples, are similar to rats but larger in mice.
Area of Science:
- Neuroscience
- Computational Neuroscience
Background:
- The mouse hippocampus is crucial for memory and cognition.
- Understanding its network patterns in vivo is essential but limited.
Purpose of the Study:
- To investigate the electrical network patterns of the mouse hippocampus in behaving animals.
- To characterize theta and gamma oscillations and other network events.
Main Methods:
- Used multisite silicon probes and wire tetrodes for in vivo electrophysiological recordings.
- Recorded from the mouse hippocampus during exploration, REM sleep, immobility, and SWS.
Main Results:
- Identified theta (6-9 Hz) and gamma (40-100 Hz) oscillations during exploration and REM sleep.
- Observed comodulation of gamma and theta power, with gamma power varying with the theta cycle.
- Phase-locking of pyramidal cells and interneurons to theta oscillations.
- Detected sharp waves in CA1 stratum radiatum and ripples (140-200 Hz) during immobility, consummatory behaviors, and SWS.
- Observed large-amplitude dentate spikes in the hilus associated with increased hilar neuron discharge.
- Noted larger field pattern amplitudes in mice compared to rats, likely due to higher neuron density.
Conclusions:
- Mouse and rat hippocampal network patterns share similar underlying pathways and mechanisms.
- The mouse hippocampus exhibits complex electrical dynamics during various behavioral states.
- Electrophysiological recordings provide valuable insights into hippocampal network function.
