Jump to ContentJump to Main Navigation
Rhythms of the Brain$
Users without a subscription are not able to see the full content.

György Buzsáki

Print publication date: 2006

Print ISBN-13: 9780195301069

Published to Oxford Scholarship Online: May 2009

DOI: 10.1093/acprof:oso/9780195301069.001.0001

Show Summary Details
Page of

PRINTED FROM OXFORD SCHOLARSHIP ONLINE (oxford.universitypressscholarship.com). (c) Copyright Oxford University Press, 2020. All Rights Reserved. An individual user may print out a PDF of a single chapter of a monograph in OSO for personal use. date: 27 November 2020

Oscillations in the “Other Cortex”: Navigation in Real and Memory Space

Oscillations in the “Other Cortex”: Navigation in Real and Memory Space

(p.277) Cycle 11 Oscillations in the “Other Cortex”: Navigation in Real and Memory Space
Rhythms of the Brain

Buzsáki György

Oxford University Press

The hippocampus and associated structures are organized in multiple loops, with reciprocal connections to the neocortex. The most prominent collective pattern of hippocampal neurons is theta oscillation. In one-dimensional tasks, pyramidal cells fire maximally at particular positions, signifying the place field center. The assembly members that define the current location also contribute spikes to the representation of past and future positions in multiple theta cycles. Similarly, positional “distances” among items of an episodic list can be coded by the synaptic strengths between the cell assemblies. In two-dimensional environments, exploration leads to crossing the same positions from different directions. These junctions serve to establish a map and subsequent landmark (map-based) navigation. The hallmark of the cognitive map is the presence of omnidirectional place cells in the hippocampus and tessellating “grid cells” in the entorhinal cortex. Neuron members of an omnidirectional or explicit assembly collectively define or symbolize the semantic “meaning” of an item.

Keywords:   spatial navigation, dead-reckoning, cognitive map, episodic memory, semantic memory, theta oscillation, distance-time compression, phase precession

Oxford Scholarship Online requires a subscription or purchase to access the full text of books within the service. Public users can however freely search the site and view the abstracts and keywords for each book and chapter.

Please, subscribe or login to access full text content.

If you think you should have access to this title, please contact your librarian.

To troubleshoot, please check our FAQs , and if you can't find the answer there, please contact us .