Cited by 957Advanced MRI Techniques and ApplicationsFunctional Brain Connectivity StudiesOptical Imaging and Spectroscopy Techniques

The neural basis of functional brain imaging signals

Attwell, David, Iadecola, Costantino·2002·Trends in Neurosciences

Abstract

The haemodynamic responses to neural activity that underlie the blood-oxygen-level-dependent (BOLD) signal used in functional magnetic resonance imaging (fMRI) of the brain are often assumed to be driven by energy use, particularly in presynaptic terminals or glia. However, recent work has suggested that most brain energy is used to power postsynaptic currents and action potentials rather than presynaptic or glial activity and, furthermore, that haemodynamic responses are driven by neurotransmitter-related signalling and not directly by the local energy needs of the brain. A firm understanding of the BOLD response will require investigation to be focussed on the neural signalling mechanisms controlling blood flow rather than on the locus of energy use.

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Crossref · 10.1016/s0166-2236(02)02264-6

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Authors
Attwell, D., & Iadecola, C.
Affiliations
  • University College London (GB)
  • Cornell University (US)
Venue
Trends in Neurosciences
Publisher
Elsevier BV
Published
2002-12
Volume
25
Issue
12
Pages
621-625
ISSN
0166-2236 (ISSN-L)
OpenAlex
W2148992333
Cited by
957
References
68
Citations by year
2026: 28 · 2025: 25 · 2024: 30 · 2023: 21 · 2022: 29 · 2021: 28 · 2020: 57 · 2019: 60 · 2018: 42 · 2017: 42 · 2016: 40 · 2015: 34 · 2014: 38 · 2013: 45 · 2012: 42
FWCI
5.81
Type
journal article
Language
en
Open access
closed
Locations
  • Trends in Neurosciences (publishedVersion)
  • PubMed (publishedVersion)
  • UCL Discovery (University College London) (submittedVersion)
Funders
  • Wellcome Trust
  • Royal Society
Topics
  • Health Sciences › Medicine › Radiology, Nuclear Medicine and Imaging › Advanced MRI Techniques and Applications
  • Life Sciences › Neuroscience › Cognitive Neuroscience › Functional Brain Connectivity Studies
  • Health Sciences › Medicine › Radiology, Nuclear Medicine and Imaging › Optical Imaging and Spectroscopy Techniques
Keywords
BOLD signal, hemodynamic response, functional MRI, brain energy metabolism, postsynaptic currents, action potential, neurotransmitter signalling, cerebral autoregulation
MeSH terms
Action Potentials, Astrocytes, Brain, Brain Mapping, Cerebrovascular Circulation, Energy Metabolism, Humans, Magnetic Resonance Imaging, Neural Inhibition, Presynaptic Terminals

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