Which “neural activity” do you mean? fMRI, MEG, oscillations and neurotransmitters

Over the last 20years, BOLD-FMRI has proved itself to be a powerful and versatile tool for the study of the neural substrate underpinning many of our cognitive and perceptual functions. However, exactly how it is coupled to the underlying neurophysiology, and how this coupling varies across the brai...

Full description

Saved in:
Bibliographic Details
Published in:NeuroImage (Orlando, Fla.) Fla.), 2012-08, Vol.62 (2), p.1121-1130
Main Author: Singh, Krish D.
Format: Article
Language:English
Subjects:
Animals
Behaviour
BOLD
Brain - physiology
Brain Mapping - history
Brain Mapping - methods
Electroencephalography
fMRI
GABA
History, 20th Century
History, 21st Century
Humans
Inverse problems
Magnetic Resonance Imaging - history
Magnetic Resonance Imaging - methods
Magnetoencephalography - history
Magnetoencephalography - methods
MEG
Neurosciences
Neurotransmitter Agents - physiology
Neurotransmitters
Oscillations
Physiology
Variability
Vision
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Over the last 20years, BOLD-FMRI has proved itself to be a powerful and versatile tool for the study of the neural substrate underpinning many of our cognitive and perceptual functions. However, exactly how it is coupled to the underlying neurophysiology, and how this coupling varies across the brain, across tasks and across individuals is still unclear. The story is further complicated by the fact that within the same cortical region, multiple evoked and induced oscillatory effects may be modulated during task execution, supporting different cognitive roles, and any or all of these may have metabolic demands that then drive the BOLD response. In this paper I shall concentrate on one experimental approach to shedding light on this problem i.e. the execution of the same experimental tasks using MEG and fMRI in order to reveal which electrophysiological responses best match the BOLD response spatially, temporally and functionally. The results demonstrate a rich and complex story that does not fit with a simplistic view of BOLD reflecting “neural activity” and suggests that we could consider the coupling between BOLD and the various parameters of neural function as an ill-posed inverse problem. Finally, I describe recent work linking individual variability in both cortical oscillations and the BOLD-fMRI response to variability in endogenous GABA concentration.
ISSN:1053-8119
1095-9572
DOI:10.1016/j.neuroimage.2012.01.028