Document Detail

Changes in hippocampal cell discharge patterns and theta rhythm spectral properties as a function of walking velocity in the guinea pig.
MedLine Citation:
PMID:  8721159     Owner:  NLM     Status:  MEDLINE    
Dorsal hippocampal theta rhythm (theta) and extracellular unit activity from CA1 pyramidal layer were recorded in awake guinea pigs, both during standing and during walking on a conveyor belt at increasing speeds. Amplitude, frequency and rhythmicity of theta increased linearly with the movement speed. In this preparation we found the same three types of unit discharge patterns that have been described in anesthetized rats in the presence of spontaneous or induced hippocampal theta: type 1, rhythmic at theta frequency and phase-locked with theta; type 2, discharging non-rhythmically but phase-locked with theta; and type 3, discharging at random. Furthermore, all units modified their firing pattern when the animals walked, either by increasing their rhythmicity and/or phase-locking with theta or by increasing their firing frequency. During walking, some type 3 units changed into type 2 or type 1, type 2 units changed to type 1, and type I increased their rhythmicity. Consequently, the unit discharge rhythmicity and phase-locking with theta increased with the speed of movement. The mean rate of neuronal discharges increased linearly as a function of walking speed. In this paper we show that the progressive spectral theta changes determined by the intensity of movement are concomitant with the increase in rhythmicity of hippocampal cells. Moreover, the firing rate of these cells, and the amplitude, frequency and rhythmicity of theta, increased linearly as a function of walking speed, suggesting that neuronal excitation may be basically responsible for these changes in theta properties.
J Rivas; J M Gaztelu; E García-Austt
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Experimental brain research     Volume:  108     ISSN:  0014-4819     ISO Abbreviation:  Exp Brain Res     Publication Date:  1996 Feb 
Date Detail:
Created Date:  1996-12-16     Completed Date:  1996-12-16     Revised Date:  2013-12-13    
Medline Journal Info:
Nlm Unique ID:  0043312     Medline TA:  Exp Brain Res     Country:  GERMANY    
Other Details:
Languages:  eng     Pagination:  113-8     Citation Subset:  IM    
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MeSH Terms
Guinea Pigs
Hippocampus / cytology,  physiology*
Motor Activity / physiology*
Neurons / physiology*
Regression Analysis
Theta Rhythm*
Time Factors

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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