Abstract
People vary markedly in the efficiency with which they can resolve competitive action decisions, even simple ones such as shifting gaze to one stimulus rather than another. We found that an individual's ability to rapidly resolve such competition is predicted by the concentration of GABA, the main inhibitory neurotransmitter, in a region of frontal cortex that is relevant for eye movements, but not in a control region (occipital cortex).
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Acknowledgements
We thank F. Boy, S. Muthukumaraswamy, B. Taud, M. Husain, C. Chambers, T. Freeman, R. Honey and L. Wilkinson. R.A.E.E. thanks G. Barker and D. Shungu for pulse programming advice. This work was supported by the ESRC, the Wellcome Trust, the Wales Institute of Cognitive Neuroscience and the Schools of Psychology, Biosciences and Chemistry at Cardiff University. Cardiff University Brain Research Imaging Centre was established with support from the UK Department of Trade and Industry, Cardiff University and the Welsh Assembly government. R.A.E.E. held an RCUK fellowship.
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P.S., R.A.E.E. and K.D.S. conceived and planned the experimental study. R.A.E.E., P.S. and C.J.E. carried out and analyzed the magnetic resonance imaging and P.S. and A.B. performed and analyzed the behavioral experiments. All authors contributed to interpretation and presentation.
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Sumner, P., Edden, R., Bompas, A. et al. More GABA, less distraction: a neurochemical predictor of motor decision speed. Nat Neurosci 13, 825–827 (2010). https://doi.org/10.1038/nn.2559
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DOI: https://doi.org/10.1038/nn.2559
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