Hippocampal glutamate concentration predicts cerebral theta oscillations during cognitive processing.

Abstract:

RATIONALE:Brain waves reflect collective behavior of neurons and provide insight into distributed network processing. Frontal and hippocampal theta oscillations (4-7 Hz) were linked to cognitive tasks and animal studies have suggested an involvement of glutamatergic neurotransmission in integrative frontal-hippocampal processing. Human evidence for such relationships is lacking. METHODS:Here, we studied the associations between glutamate concentrations in the hippocampal region, measured by a 3-T proton magnetic resonance spectroscopy (1H-MRS), and EEG theta activity during an auditory target detection paradigm. RESULTS:A robust relationship between hippocampal glutamate and frontal theta activity during stimulus processing was found. Moreover, frontal theta oscillations were related to response speed. CONCLUSION:The results suggest a functional coupling between the frontal cortex and hippocampal region during stimulus processing and support the idea of the hippocampus as a neural rhythm generator driven by glutamatergic neurotransmission. These preliminary data show, for the first time, a relationship between in vivo measured glutamate and basic cerebral information processing in humans.

journal_title

Psychopharmacology

authors

Gallinat J,Kunz D,Senkowski D,Kienast T,Seifert F,Schubert F,Heinz A

doi

10.1007/s00213-006-0397-0

subject

Has Abstract

pub_date

2006-07-01 00:00:00

pages

103-11

issue

1

eissn

0033-3158

issn

1432-2072

journal_volume

187

pub_type

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