Occipital GABA correlates with cognitive failures in daily life.

TitleOccipital GABA correlates with cognitive failures in daily life.
Publication TypeJournal Article
Year of Publication2014
AuthorsSandberg K, Blicher JUdby, Dong MYuan, Rees G, Near J, Kanai R
Date Published2014 Feb 15
KeywordsAdult, Attention, Brain Mapping, Cognition, gamma-Aminobutyric Acid, Humans, Magnetic Resonance Imaging, Magnetic Resonance Spectroscopy, Male, Surveys and Questionnaires, Visual Cortex, Young Adult

The brain has limited capacity, and so selective attention enhances relevant incoming information while suppressing irrelevant information. This process is not always successful, and the frequency of such cognitive failures varies to a large extent between individuals. Here we hypothesised that individual differences in cognitive failures might be reflected in inhibitory processing in the sensory cortex. To test this hypothesis, we measured GABA in human visual cortex using MR spectroscopy and found a negative correlation between occipital GABA (GABA+/Cr ratio) and cognitive failures as measured by an established cognitive failures questionnaire (CFQ). For a second site in parietal cortex, no correlation between CFQ score and GABA+/Cr ratio was found, thus establishing the regional specificity of the link between occipital GABA and cognitive failures. We further found that grey matter volume in the left superior parietal lobule (SPL) correlated with cognitive failures independently from the impact of occipital GABA and together, occipital GABA and SPL grey matter volume statistically explained around 50% of the individual variability in daily cognitive failures. We speculate that the amount of GABA in sensory areas may reflect the potential capacity to selectively suppress irrelevant information already at the sensory level, or alternatively that GABA influences the specificity of neural representations in visual cortex thus improving the effectiveness of successful attentional modulation.

Alternate JournalNeuroimage
PubMed ID24188817
PubMed Central IDPMC3907676
Grant List091593 / / Wellcome Trust / United Kingdom
100227 / / Wellcome Trust / United Kingdom
/ / Wellcome Trust / United Kingdom