Neurochemical Effects of Theta Burst Stimulation as Assessed by Magnetic Resonance Spectroscopy
Author(s) -
Charlotte J. Stagg,
Marzena Wylezinska,
Paul M. Matthews,
Heidi JohansenBerg,
Peter Jezzard,
John C. Rothwell,
Sven Bestmann
Publication year - 2009
Publication title -
journal of neurophysiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.302
H-Index - 245
eISSN - 1522-1598
pISSN - 0022-3077
DOI - 10.1152/jn.91060.2008
Subject(s) - ctbs , neurochemical , neuroscience , stimulation , transcranial magnetic stimulation , glutamate receptor , gabaergic , psychology , neurotransmission , glutamine , chemistry , inhibitory postsynaptic potential , primary motor cortex , receptor , biochemistry , amino acid
Continuous theta burst stimulation (cTBS) is a novel transcranial stimulation technique that causes significant inhibition of synaptic transmission for <or=1 h when applied over the primary motor cortex (M1) in humans. Here we use magnetic resonance spectroscopy to define mechanisms mediating this inhibition by noninvasively measuring local changes in the cortical concentrations of gamma-aminobutyric acid (GABA) and glutamate/glutamine (Glx). cTBS to the left M1 led to an increase in GABA compared with stimulation at a control site without significant change in Glx. This direct evidence for increased GABAergic interneuronal activity is framed in terms of a new hypothesis regarding mechanisms underlying cTBS.
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