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Muehlemann, Thomas, Daniel Haensse, and Martin Wolf, “Wireless Miniaturized Near-Infrared Scans”, Optics Express 16, no. 14 (July 7, 2008), pp. 10323–10330, http:// www.ncbi.nlm.nih.gov/pubmed/18607442; Piper, Sophie K., Arne Krueger, Stefan P. Koch, Jan Mehnert, Christina Habermehl, Jens Steinbrink, Hellmuth Obrig, and Christoph H. Schmitz, “A Wearable Multi-Channel fNIRS System for Brain Imaging in Freely Moving Subjects”, NeuroImage 85, no. 1 (January 15, 2014), pp. 64–71, http://www.science direct.com/science/article/pii/S1053811913007003. The development of NIR technology has been fitful, particularly with comparison to fMRI; see Gary, Joseph P. Culver, John H. Thompson, and David A. Boas, “A Quantitative Comparison of Simultaneous BOLD fMRI and NIRS Recordings During Functional Brain Activation”, NeuroImage 17, no. 2 (October 2002), pp. 719–731, http://www.sciencedirect.com/science/article/pii /S1053811902912279; and Wolf, Martin, Marco Ferrari, and Valentina Quaresima, “Progress of Near-Infrared Spectroscopy and Topography for Brain and Muscle Clinical Applications”, Journal of Biomedical Optics 12, no. 6 (November – December 2007), n.p., http:// biomedicaloptics.spiedigitallibrary.org/article.aspx?articleid=1351966.