Correlations between general cognitive performance, power spectral density (Panel A), wPLI-based functional connectivity (Panel B) and other EEG features (Panel C). Correlations are shown after increasingly strict covariate sets: no covariates (Model 1), demographic covariates added (Model 2), health covariates added (Model 3), quality of life covariates added (Model 4). For PSD and wPLI, correlations are shown as a function of frequency. For other EEG features, only the distribution of correlation is shown for simplicity, as no correlation is significant after adjusting for multiple comparisons. On all plots, black lines indicate the critical correlation coefficient.