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. 2014 Jun 26;15:81. doi: 10.1186/1471-2202-15-81

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Copyright © 2014 Kobayashi et al.; licensee BioMed Central Ltd.

This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly credited. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Mean Z-score of oxy- and deoxy-Hb (A-D) and the channels that showed significant increases of oxy-Hb (E). (A-D) The black bar represents the mean Z-score of the different-face condition, and the white bar represents that of the same-face condition. For 5- to 6-month-olds (A and B), deoxy-Hb in the same-face condition significantly decreased in the right temporal area. At 7- to 8-month-olds (C and D), oxy-Hb concentration in both temporal areas significantly increased compared to the baseline (0). Furthermore, oxy-Hb and deoxy-Hb in bilateral temporal areas significantly differed between the same-face and different-face condition. (E) The channels showed significant increases of oxy-Hb in the different-face condition compared to the baseline period in 7- to 8-month-olds (two-tailed t-test, p < .05). The significant p-value α was determined on the basis of the method of controlling the false discovery rate. In these channels, oxy-Hb concentration differed significantly between the same-face condition and the different-face condition. (The infant’s parents provided written informed consent for publication of this photograph.).