Hippocampal theta rhythm and drug-related reward-seeking behavior: An analysis of cocaine-induced conditioned place preference in rats

Yuji Takano, Tomoko Tanaka, Haruka Takano, Naoyuki Hironaka

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)

Abstract

Drug cravings are elicited by environmental stimuli associated with the rewarding effects of drugs. As an animal model of such associative learning, conditioned place preference (CPP) is widely used. Since the hippocampus is closely related to reward memory and the hippocampal local field potential (LFP), and in particular the theta rhythm is known to be associated with bodily movements, the theta rhythm might be one of the key neural substrates. On the basis of this assumption, we recorded the behaviors and hippocampal LFP of eight rats during cocaine-induced acquisition and expression of CPP. The earliest appearance of phase-locked theta activity was observed before the rats entered the cocaine-paired environment after conditioning; after entrance, the theta disappeared. This phase-locked theta was stronger when the rats stayed for a long time in the cocaine-paired environment. Our observation suggested that the phase-locked hippocampal theta rhythm is related to the approaching behavior of the rat caused by reward memory. Thus, the role of the hippocampus in drug craving should be emphasized further.

Original languageEnglish
Pages (from-to)94-103
Number of pages10
JournalBrain research
Volume1342
DOIs
Publication statusPublished - 2010 Jun 25
Externally publishedYes

Keywords

  • Cocaine
  • Conditioned place preference
  • Drug addiction
  • Hippocampal theta

ASJC Scopus subject areas

  • Neuroscience(all)
  • Molecular Biology
  • Clinical Neurology
  • Developmental Biology

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