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Figure 2 | BMC Neuroscience

Figure 2

From: Sleepiness induced by sleep-debt enhanced amygdala activity for subliminal signals of fear

Figure 2

Correlation analysis of the correlation with subjective sleepiness. A)–C) Statistical parametric mapping of different brain regions showing a significant correlation with subjective sleepiness during a face-viewing task: A) nonconscious + fear contrasts, B) nonconscious + neutral contrasts, and C) nonconscious + fear vs. neutral contrasts. Red and blue areas show a significant positive and negative correlation with subjective sleepiness, respectively. A) In the nonconscious + fear contrasts, a significant positive correlation is observed in the bilateral amygdala, hippocampus, insula, and ventromedial prefrontal cortex, whereas a significant negative correlation is observed in the secondary and tertiary visual areas and the fusiform face area. B) In the nonconscious + neutral contrasts, a significant positive correlation is observed in the ventromedial prefrontal cortex, posterior cingulate cortex, and precuneus, whereas a significant negative correlation is observed in the secondary and tertiary visual areas and the fusiform face area. C) In the nonconscious + fear vs. neutral contrasts, the bilateral amygdala and posterior cingulate cortex show a significant positive and negative correlation, respectively. Abbreviations: NcF = Nonconscious fear condition; NcN = Nonconscious neutral condition; Amy = Amygdala; HC = Hippocampus; vMPFC = ventromedial prefrontal cortex; MPFC = medial prefrontal cortex; R Ins = Right Insula; L Ins = Left Insula; FFA = Fusiform face area; PCC = Posterior cingulate cortex; Prec = Precuneus; p < 0.001 uncorrected, cluster k > 5-voxel threshold; Degrees of freedom (df) = 20.

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