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The Journal of Neuroscience, 2001, 21:RC145:1-4

RAPID COMMUNICATION
Behavior-Dependent States of the Hippocampal Network Affect Functional Clustering of Neurons

Hajime Hirase, Xavier Leinekugel, Jozsef Csicsvari, András Czurkó, and György Buzsáki

Center for Molecular and Behavioral Neuroscience, Rutgers, The State University of New Jersey, Newark, New Jersey 07102

Local versus distant coherence of hippocampal CA1 pyramidal cells was investigated in the behaving rat. Temporal cross-correlation of pyramidal cells revealed a significantly stronger relationship among local (<140 µm) pyramidal neurons compared with distant (>300 µm) neurons during non-theta-associated immobility and sleep but not during theta-associated running and walking. In contrast, cross-correlation between local pyramidal cell-interneuron pairs was significantly stronger than between distant pairs during theta oscillations but were similar during non-theta-associated behaviors. We suggest that network state-dependent functional clustering of neuronal activity emerges because of the differential contribution of the main excitatory inputs, the perforant path, and Schaffer collaterals during theta and non-theta behaviors.

Key words: pyramidal cell; interneuron; sleep; synchrony; theta; sharp waves

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				J. Csicsvari, D. A. Henze, B. Jamieson, K. D. Harris, A. Sirota, P. Bartho, K. D. Wise, and G. Buzsaki Massively Parallel Recording of Unit and Local Field Potentials With Silicon-Based Electrodes J Neurophysiol, August 1, 2003; 90(2): 1314 - 1323. [Abstract] [Full Text] [PDF]

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