The physiological origin of task-evoked systemic artefacts in functional near infrared spectroscopy
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open access
Highlights
► Task-evoked changes in the skin blood volume induce artefacts in fNIRS signals. ► Artefacts result from a venous volume decrease due to sympathetic vasoconstriction. ► This phenomenon might induce false positives in fNIRS experiments on the forehead.
Keywords
Time-domain optical brain imaging
Systemic changes
Skin blood flow
Periphery physiology
fMRI
Frontal lobe
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Copyright © 2012 Elsevier Inc.