Reactivation of experience-dependent cell assembly patterns in the hippocampus.

Abstract:

:The hippocampus is thought to be involved in episodic memory formation by reactivating traces of waking experience during sleep. Indeed, the joint firing of spatially tuned pyramidal cells encoding nearby places recur during sleep. We found that the sleep cofiring of rat CA1 pyramidal cells encoding similar places increased relative to the sleep session before exploration. This cofiring increase depended on the number of times that cells fired together with short latencies (<50 ms) during exploration, and was strongest between cells representing the most visited places. This is indicative of a Hebbian learning rule in which changes in firing associations between cells are determined by the number of waking coincident firing events. In contrast, cells encoding different locations reduced their cofiring in proportion to the number of times that they fired independently. Together these data indicate that reactivated patterns are shaped by both positive and negative changes in cofiring, which are determined by recent behavior.

journal_name

Nat Neurosci

journal_title

Nature neuroscience

authors

O'Neill J,Senior TJ,Allen K,Huxter JR,Csicsvari J

doi

10.1038/nn2037

subject

Has Abstract

pub_date

2008-02-01 00:00:00

pages

209-15

issue

2

eissn

1097-6256

issn

1546-1726

pii

nn2037

journal_volume

11

pub_type

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