Simultaneous measurement of time-domain fNIRS and physiological signals during a cognitive task

A. Jelzow; I. Tachtsidis; E. Kirilina; M. Niessing; R. Brühl; H. Wabnitz; A. Heine; B. Ittermann; R. Macdonald

doi:10.1117/12.889484

9 June 2011 Simultaneous measurement of time-domain fNIRS and physiological signals during a cognitive task

A. Jelzow, I. Tachtsidis, E. Kirilina, M. Niessing, R. Brühl, H. Wabnitz, A. Heine, B. Ittermann, R. Macdonald

Proceedings Volume 8088, Diffuse Optical Imaging III; 808803 (2011) https://doi.org/10.1117/12.889484
Event: European Conferences on Biomedical Optics, 2011, Munich, Germany

Abstract

Functional near-infrared spectroscopy (fNIRS) is a commonly used technique to measure the cerebral vascular response related to brain activation. It is known that systemic physiological processes, either independent or correlated with the stimulation task, can influence the optical signal making its interpretation challenging. The aim of the present work is to investigate the impact of task-evoked changes in the systemic physiology on fNIRS measurements for a cognitive paradigm. For this purpose we carried out simultaneous measurements of time-domain fNIRS on the forehead and systemic physiological signals, i.e. mean blood pressure, heart rate, respiration, galvanic skin response, scalp blood flow (flux) and red blood cell (RBC) concentration changes. We performed measurements on 15 healthy volunteers during a semantic continuous performance task (CPT). The optical data was analyzed in terms of depth-selective moments of distributions of times of flight of photons through the tissue. In addition, cerebral activation was localized by a subsequent fMRI experiment on the same subject population using the same task. We observed strong non-cerebral task-evoked changes in concentration changes of oxygenated hemoglobin in the forehead. We investigated the temporal behavior and mutual correlations between hemoglobin changes and the systemic processes. Mean blood pressure (BP), galvanic skin response (GSR) and heart rate exhibited significant changes during the activation period, whereby BP and GSR showed the highest correlation with optical measurements.

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A. Jelzow, I. Tachtsidis, E. Kirilina, M. Niessing, R. Brühl, H. Wabnitz, A. Heine, B. Ittermann, and R. Macdonald "Simultaneous measurement of time-domain fNIRS and physiological signals during a cognitive task", Proc. SPIE 8088, Diffuse Optical Imaging III, 808803 (9 June 2011); https://doi.org/10.1117/12.889484

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