Before revision:  In this proof-of-concept study, MDD patients in the experimental group (n=16) used rtfMRI-EEG-nf during a happy emotion induction task to simultaneously upregulate four brain activity measures relevant to MDD.
After revision:  In this proof-of-concept study, MDD patients in the experimental group (n=16) used rtfMRI-EEG-nf during a happy emotion induction task to simultaneously upregulate two fMRI and two EEG activity measures relevant to MDD.