Evidence map›Paper›PMID 28284797›Full record

ArticleNeuroImage2017

Comparing GABA-dependent physiological measures of inhibition with proton magnetic resonance spectroscopy measurement of GABA using ultra-high-field MRI.

Katherine Dyke, Sophia E Pépés, Chen Chen, Soyoung Kim, Hilmar P Sigurdsson, Amelia Draper, Masud Husain, Parashkev Nachev, Penelope A Gowland, Peter G Morris and 1 more

Open access · hybridAbstract read
In one paragraph

Article in NeuroImage, 2017. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 75 papers, 1 of them a synthesis that pooled it.

0numbers the graph read from it
0cells of the map it votes in
75citing papers in PubMed, 1 pooled it
6.9field-weighted citation impact, top 2% of its field
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

75 citing papers in PubMed, 1 synthesis or guideline pooled it, 128 citations in OpenAlex.

  1. Pooled it
  2. Trial
  3. Trial
  4. Diverse excess GABA modes drive autism and epilepsy-autism comorbidity.Journal of neural transmission (Vienna, Austria : 1996) · 2026
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  19. Acupuncture for generalized anxiety disorder: a study protocol for a randomized controlled trial.Brazilian journal of medical and biological research = Revista brasileira de pesquisas medicas e biologica · 2024
    Article
  20. Magnetic Resonance Spectroscopy (MRS) in Alzheimer's Disease.Methods in molecular biology (Clifton, N.J.) · 2024
    Article

15 more citing papers are in PubMed but not listed here.

4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

11 authors at 4 institutions in 1 country.

Katherine DykeSchool of Psychology, University of Nottingham, UK.
Sophia E PépésSchool of Psychology, University of Nottingham, UK.
Chen ChenSir Peter Mansfield Imaging Centre, University of Nottingham, UK.
Soyoung KimSchool of Psychology, University of Nottingham, UK; Institute of Mental Health, School of Medicine, University of Nottingham, UK.
Hilmar P SigurdssonSchool of Psychology, University of Nottingham, UK.
Amelia DraperSchool of Psychology, University of Nottingham, UK; Nuffield Department of Clinical Neuroscience, University of Oxford, UK.
Masud HusainNuffield Department of Clinical Neuroscience, University of Oxford, UK.
Parashkev NachevInstitute of Cognitive Neuroscience, University College London, UK.
Penelope A GowlandSir Peter Mansfield Imaging Centre, University of Nottingham, UK.
Peter G MorrisSir Peter Mansfield Imaging Centre, University of Nottingham, UK.
Stephen R JacksonSchool of Psychology, University of Nottingham, UK. Electronic address: Stephen.jackson@nottingham.ac.uk.
University of Nottingham · GBUniversity of Oxford · GBInstitute of Mental Health · GBUniversity College London · GB

Funding

Medical Research Council G0901321Medical Research Council MR/M009122/1
6 · The paper itself

Abstract

Imbalances in glutamatergic (excitatory) and GABA (inhibitory) signalling within key brain networks are thought to underlie many brain and mental health disorders, and for this reason there is considerable interest in investigating how individual variability in localised concentrations of these molecules relate to brain disorders. Magnetic resonance spectroscopy (MRS) provides a reliable means of measuring, in vivo, concentrations of neurometabolites such as GABA, glutamate and glutamine that can be correlated with brain function and dysfunction. However, an issue of much debate is whether the GABA observed and measured using MRS represents the entire pool of GABA available for measurement (i.e., metabolic, intracellular, and extracellular) or is instead limited to only some portion of it. GABA function can also be investigated indirectly in humans through the use of non-invasive transcranial magnetic stimulation (TMS) techniques that can be used to measure cortical excitability and GABA-mediated physiological inhibition. To investigate this issue further we collected in a single session both types of measurement, i.e., TMS measures of cortical excitability and physiological inhibition and ultra-high-field (7 T) MRS measures of GABA, glutamate and glutamine, from the left sensorimotor cortex of the same group of right-handed individuals. We found that TMS and MRS measures were largely uncorrelated with one another, save for the plateau of the TMS IO curve that was negatively correlated with MRS-Glutamate (Glu) and intra-cortical facilitation (10ms ISI) that was positively associated with MRS-Glutamate concentration. These findings are consistent with the view that the GABA concentrations measured using the MRS largely represent pools of GABA that are linked to tonic rather than phasic inhibition and thus contribute to the inhibitory tone of a brain area rather than GABAergic synaptic transmission.

Indexed as

Neural InhibitionAdultEvoked Potentials, MotorFemalegamma-Aminobutyric AcidHumansMagnetic Resonance ImagingMaleMotor CortexProton Magnetic Resonance SpectroscopyReproducibility of ResultsTranscranial Magnetic StimulationYoung Adultgamma-Aminobutyric Acid

Identifiers

PMID28284797
PMCPMC5440178
OpenAlexW2594378689

What OpenQuestion holds

Textmetadata
LicenceCC BY
Read underepoch 390

Registered trials

None linked

Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.