Physiological noise

Definition: In the context of fNIRS, physiological noise reflects physiological activity (e.g., blood pressure fluctuations related to heart rate, respiration, and low-frequency oscillations) that are not related to the hemodynamic signal of interest, i.e. the hemodynamic signal that indexes neural activity. Physiological noise can be captured as a global component in overall brain activity, or measured in surface vasculature, later to be removed from the fNIRS signal. Definition: In the context of fNIRS, physiological noise reflects physiological activity (e.g., blood pressure fluctuations related to heart rate, respiration, and low-frequency oscillations) that are not related to the hemodynamic signal of interest, i.e. the hemodynamic signal that indexes neural activity. Physiological noise can be captured as a global component in overall brain activity, or measured in surface vasculature, later to be removed from the fNIRS signal.

Alternative definition:

Synonym: Physiologic or Metabolic Artifact, Systemic Activity

References: National Cancer Institute. National Cancer Institute Thesaurus, 2017. Documentation page available on http://nciterms.nci.nih.gov.

Related terms: Preprocessing, Artifact Correction, contamination, Extracerebral components, artifact, noise, Mayer wave  

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