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Previous Article | Next Article
The Journal of Neuroscience, January 1, 1998, 18(1):388-398
Gamma Oscillations in the Entorhinal Cortex of the Freely Behaving Rat
J. J. Chrobak and G. Buzsáki Center for Molecular and Behavioral Neuroscience, Rutgers, The State University of New Jersey, Newark, New Jersey 07102
Gamma frequency field oscillations (40-100 Hz) are nested within theta oscillations in the dentate-hilar and CA1-CA3 regions of the hippocampus during exploratory behaviors. These oscillations reflect synchronized synaptic potentials that entrain the discharge of neuronal populations within the ~10-25 msec range. Using multisite recordings in freely behaving rats, we examined gamma oscillations within the superficial layers (I-III) of the entorhinal cortex. These oscillations increased in amplitude and regularity in association with entorhinal theta waves. Gamma waves showed an amplitude minimum and reversed in phase near the perisomatic region of layer II, indicating that they represent synchronized synaptic potentials impinging on layer II-III neurons. Theta and gamma oscillations in the entorhinal cortex were coupled with theta and gamma oscillations in the dentate hilar region. The majority of layer II-III neurons discharged irregularly but were phase-related to the negative peak of the local (layer II-III) gamma field oscillation. These findings demonstrate that layer II-III neurons discharge in temporally defined gamma windows (~10-25 msec) coupled to the theta cycle. This transient temporal framework, which emerges in both the entorhinal cortex and the hippocampus, may allow spatially distributed subpopulations to form temporally defined ensembles. We speculate that the theta-gamma pattern in the discharge of these neurons is essential for effective neuronal communication and synaptic plasticity in the perforant pathway.
Key words: neuronal cooperativity; unit activity; theta waves; gamma; plasticity; Alzheimer's dementia; perforant pathway; LTP/LTD
Copyright © 1998 Society for Neuroscience 0270-6474/98/181388-11$05.00/0
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