Plots of mean amygdala signal versus CAPS scores.

<p>Mean BOLD signal was calculated as described in Methods, and is displayed in arbitrary units. <b>A)</b> Mean amygdala signal during the less-arousing movie plotted against CAPS scores (black dots; <i>r</i> = 0.40, <i>p</i> = 0.0041); also shown are predicted mean amygdala signal (black line) as a linear function of CAPS scores and 95% prediction confidence intervals (CI) depicted by gray shaded region. Quartiles of CAPS scores are indicated by the three vertical dashed lines. <b>B)</b> Mean amygdala signal, predicted mean amygdala signal, and 95% prediction CI as a function of CAPS for the more-arousing movie (<i>r</i> = -0.29, <i>p</i> = 0.039), plotted as in Fig 2A. <b>C)</b> Predicted means and 95% CI as functions of CAPS scores shown together to highlight the opposing effects of movie content on amygdala BOLD signal levels. At the CAPS score of 62.5, predicted signal for the two movies is identical. The 95% CI were calculated separately for the two movies, and this accounts for the extensive overlap. A more accurate impression of the difference in mean amygdala BOLD is provided by the difference depicted in <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0130246#pone.0130246.g001" target="_blank">Fig 1D</a>. <b>D)</b> Mean amygdala BOLD signal during more-arousing movie minus that during the less-arousing movie (dots), predicted mean amygdala signal (line), and predicted 95% CI (dark gray) plotted against CAPS scores (<i>r</i> = -0.46, <i>p</i> = 0.00089).