Figure 1. Correlations between sleep quality and cross-sectional estimates of cortical volume.

(A) Spatial maps display regions where poor sleep quality was significantly associated with reduced cortical volume (p < 0.05, after correction for multiple comparisons across the surface). Age, sex, interval between MRI and Pittsburgh Sleep Quality Inventory (PSQI) acquisition, and intracranial volume were included as covariates. (B) Scatterplot of the correlation between sleep quality and cortical volume within the significant cluster (expressed as a z score).