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. 2016 Nov 17;10:578. doi: 10.3389/fnhum.2016.00578

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Copyright © 2016 Vrana, Meier, Hotz-Boendermaker, Humphreys and Scholkmann.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution and reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Experimental setup. (A) Example of an functional near-infrared spectroscopy (fNIRS) optode (1: enclosure of the optical fiber, 2: tip of the light emitting diode (LED)). (B) The force sensor from the bottom (this side is placed on the skin), (C) The inside of the force sensor. (D) Subject with the force sensor attached on third lumbar spinous process (L3), (E) Probe array on the subject’s head, (F) Fixation of a source and detector distance by using so-called distance-holders. (G) Visualization of the applied manual posterior-to-anterior (PA) pressure on the L3 in a subject lying in prone position on a massage bench, (H) Sensitivity profile [mm⁻¹] of the probe array (calculated using AtlasViewer as implemented in HOMER2) including the detailed array of all channels. The sensitivity values are displayed in log10 units. The profile was calculated for 10 million photons.