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. 2014 Aug 19;15:97. doi: 10.1186/1471-2202-15-97

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© Motomura et al.; licensee BioMed Central Ltd. 2014

This article is published under license to BioMed Central Ltd. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0), 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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Correlation scatter graph for subjective sleepiness and amygdala activity. In fear-neutral contrasts, amygdala activity is significantly positively correlated with subjective sleepiness during a face-viewing task (r[20] = 0.71, p < 0.001). Amygdala activity was obtained by averaging clusters in the bilateral amygdala that showed a significant positive correlation in correlation analysis (p < 0.001, uncorrected). Data from the SC and SD sessions are shown in different colors in the graph. ●, SC; □, SD. Abbreviations: SC = sleep control condition; SD = sleep debt condition; Degrees of freedom (df) = 20.