Figure 4.

Relationship between BOLD signal change and spectral power change. (A) Regression coefficients (B) from the regression model Y = XB+ε where X = [X_HFB] for each subject show that power change in HFB correlated positively with BOLD signal change. For one subject, the relation between the BOLD change predicted by the model and the actual BOLD change is shown. (B) Regression coefficients (B) from the model Y = XB+ε where X = [X_HFB X _α] show that power change in HFB correlated positively with BOLD signal change, while spectral changes in the α band correlated negatively. For one subjects the relation between the BOLD change predicted by the model and the actual BOLD change is shown. Note the better fit compared to (A) where the model only includes X_HFB. [Color figure can be viewed in the online issue, which is available at wileyonlinelibrary.com.]