Journal
NEUROPSYCHOPHARMACOLOGY
Volume 42, Issue 2, Pages 502-511Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/npp.2016.133
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Funding
- Centre for Addiction and Mental Health (CAMH) Foundation
- Canadian Institutes of Health Research (CIHR)-Dystonia Medical Research Foundation
- Parkinson Canada
- NARSAD
- Slaight Family Centre for Youth in Transition at the CAMH
- Natural Sciences and Engineering Research Council of Canada (NSERC)
- Ontario Brain Institute (OBI)
- Brain Canada
- Brain and Behavior Research Foundation
- Canada Foundation for Innovation
- CIHR
- Ontario Ministry of Health and Long-Term Care
- Ontario Ministry of Research and Innovation
- US National Institute of Health (NIH)
- W Garfield Weston Foundation
- NHMRC [606907]
- Cervel Neurotech
- Sepracor
- AstraZeneca
- NIH
- Temerty Family through the CAMH Foundation
- Campbell Research Institute
- Brainsway Ltd.
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Short-interval intracortical inhibition (SICI) and intracortical facilitation (ICF) are noninvasive transcranial magnetic stimulation (TMS) measures of GABA(A) receptor-mediated inhibition and glutamatergic excitatory transmission, respectively. Conventionally these measures have been restricted to the motor cortex. We investigated whether SICI and ICF could be recorded from the dorsolateral prefrontal cortex (DLPFC) using combined TMS and electroencephalography (TMS EEG). We first characterized the neural signature of SICI and ICF in MI in terms of TMS-evoked potentials (TEPs) and spectral power modulation. Subsequently, these paradigms were applied in the DLPFC to determine whether similar neural signatures were evident With TMS at MI, SICI and ICF led to bidirectional modulation (inhibition and facilitation, respectively) of P30 and P60 TEP amplitude, which correlated with MEP amplitude changes. With DLPFC stimulation, P60 was bidirectionally modulated by SICI and ICF in the same manner as for M I stimulation, whereas P30 was absent The sole modulation of early TEP components is in contradistinction to other measures such as long-interval intracortical inhibition and may reflect modulation of short latency excitatory and inhibitory postsynaptic potentials (EPSPs and IPSPs). Overall, the data suggest that SICI and ICF can be recorded using TMS EEG in DLPFC providing noninvasive measures of glutamatergic and GABA(A) receptor-mediated neurotransmission. This may facilitate future research attempting to ascertain the role of these neurotransmitters in the pathophysiology and treatment of neurological and psychiatric disorders.
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