Frequency-dependent activation pattern in the rat hippocampus, a simultaneous electrophysiological and fMRI study.

Frequency-dependent activation pattern in the rat hippocampus, a simultaneous electrophysiological and fMRI study. Research Abstract Details 

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Frequency-dependent activation pattern in the rat hippocampus, a simultaneous electrophysiological and fMRI study. Abstract Text:

Frank Angenstein,Elena Kammerer,Heiko G Niessen,Julietta U Frey,Henning Scheich,Sabine Frey,

Frequency-dependent hippocampal activation during electrical perforant pathway stimulation was analyzed simultaneously by electrophysiological recordings in dentate gyrus and functional magnetic resonance imaging (fMRI). Pulse trains at low-frequency stimulation (2.5 Hz) did not influence electrophysiological responses within stimulation trains in the dentate gyrus and triggered no detectable BOLD responses. Increased stimulation frequencies (5.0-20 Hz) generated a roughly linear enhancement of the BOLD response. The BOLD signal within the dentate gyrus correlated more closely with stimulus pattern than with generated action potentials of the granular cells. However, the BOLD signal was strongly influenced by additional local signal processing activated by repetitive stimulus trains. fMRI visualized a frequency-specific spatial activation pattern of the hippocampus; spatially restricted activation in the dentate gyrus during 5-Hz stimulation, activation of the entire hippocampus and subiculum at 10 Hz and activation of the contralateral hippocampus during 20-Hz stimulation.

Frequency-dependent activation pattern in the rat hippocampus, a simultaneous electrophysiological and fMRI study. Publishing Authors By Initials

F Angenstein,E Kammerer,HG Niessen,JU Frey,H Scheich,S Frey,

For similar animals: chordata: vertebrates: mammals: rodentia: muridae: murinae: rats: rats, wistar research abstracts see: animals: chordata: vertebrates: mammals: rodentia: muridae: murinae: rats: rats, wistar research

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Frequency-dependent activation pattern in the rat hippocampus, a simultaneous electrophysiological and fMRI study. Journal Published:

PUBLICATION TYPE: Research Support, Non-U.S. Gov

Journal: NeuroImage

VOLUME: 38

Page Numbers: 150-63

Journal Abbreviation: Neuroimage

ISSN: 1053-8119

DAY: 3

MONTH: 08

YEAR: 2007

Frequency-dependent activation pattern in the rat hippocampus, a simultaneous electrophysiological and fMRI study. Information

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LANGUAGE: eng

NlmUniqueID: 9215515

Frequency-dependent activation pattern in the rat hippocampus, a simultaneous electrophysiological and fMRI study. Keywords Mesh Terms:

KEYWORDS: Rats, Wistar

MESH TERMS: methods

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Grant and Affiliation Information for Frequency-dependent activation pattern in the rat hippocampus, a simultaneous electrophysiological and fMRI study.

AFFILIATION: Leibniz Institute for Neurobiology, Special Lab Non-Invasive Brain Imaging, Magdeburg, Germany. angenstein@ifn-magdeburg.de

Country: United States

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MEDLINETA: Neuroimage

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