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The Hippocampus Book$
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Per Andersen, Richard Morris, David Amaral, Tim Bliss, and John O'Keefe

Print publication date: 2006

Print ISBN-13: 9780195100273

Published to Oxford Scholarship Online: May 2009

DOI: 10.1093/acprof:oso/9780195100273.001.0001

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Hippocampal Neurophysiology in the Behaving Animal

Hippocampal Neurophysiology in the Behaving Animal

Chapter:
(p.475) 11 Hippocampal Neurophysiology in the Behaving Animal
Source:
The Hippocampus Book
Author(s):

O’Keefe John

Publisher:
Oxford University Press
DOI:10.1093/acprof:oso/9780195100273.003.0011

This chapter focuses on the neural correlates of hippocampal EEG and single-unit activity. It shows that EEG can be categorized into several frequency bands: theta, beta, gamma, and the high-frequency ripples. Each of these has a different behavioral correlate and is reflected by different firing patterns in hippocampal interneurons. In rodents, the beta and gamma oscillations relate primarily to olfactory stimuli, but theta and the ripples have much broader correlates. There are two types of theta, which are differentially sensitive to cholinergic drugs: a-Theta is activated during periods of arousal or attention, and t-theta is related to movements (e.g., walking, swimming, jumping) that translate the animal's position relative to the environment. Hippocampal interneurons fire in synchrony with the concurrent theta; and various types of interneuron, targeting different parts of the pyramidal cell, preferentially fire on different phases of theta.

Keywords:   hippocampus, hippocampal electrical activity, head direction cells, theta, beta, gamma, cells

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