Fig. 1.

Differences in FC in the PI group compared to the GS group. a) Areas where FC was stronger in the PI group compared to the GS group. Red areas: right superior frontal gyrus and frontal poles; green area: precuneus. b) Areas where FC was weaker in the PI group compared to the GS group. Blue area: right orbitofrontal cortex; green area: left angular gyrus; pink area: left fusiform. The colored areas indicate differences in FC in relation to the same-colored seed region. Abbreviations: FC, functional connectivity; PI, psychophysiological insomnia; GS, good sleepers; rt., right; lt., left. Thresholded at a whole-brain false discovery rate-corrected cluster level of q < 0.05 and an uncorrected peak level of P < 0.001.