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. 2014 Jan 29;8:18. doi: 10.3389/fnhum.2014.00018

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Copyright © 2014 Walker, Low, Cohen, Fabiani and Gratton.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or 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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Locations of sources and detectors on the scalp of a representative participant. Light sources are indicated by a red dot and detectors are indicated by an orange dot. Green marks denote fiducial points (nasion and preauricular locations).