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. Author manuscript; available in PMC: 2013 Nov 15.

Published in final edited form as: Neuroimage. 2012 Jul 20;63(3):1571–1584. doi: 10.1016/j.neuroimage.2012.07.015

Fig. 9 — (a)-(e) Amplitudes of measured [HbO] LFOs as a function of source-detector distance in the range 1.0-2.5 cm (left side). (f)-(j) Phase difference between measured [Hb] and [HbO] LFOs. Sleep stages are indicated by different symbols. The shortest (1 cm) and farthest (2.5 cm) source-detector separation distances were compared within each sleep stage by t and U² tests (p < 0.05 indicated by a * followed by the associated sleep stage).

Fig. 9 — (a)-(e) Amplitudes of measured [HbO] LFOs as a function of source-detector distance in the range 1.0-2.5 cm (left side). (f)-(j) Phase difference between measured [Hb] and [HbO] LFOs. Sleep stages are indicated by different symbols. The shortest (1 cm) and farthest (2.5 cm) source-detector separation distances were compared within each sleep stage by t and U² tests (p < 0.05 indicated by a * followed by the associated sleep stage).