Fig. 1: Summary of imaging findings and their relationship with outcome.
From: Prognosis and improved outcomes in major depression: a review

Imaging findings exhibiting unidirectional (left) relationships with outcome in MDD vs. bidirectional (right). fMRI, functional magnetic resonance imaging; PET, positron emission tomography; EEG electroencephalography; 5-HT1A, serotonin-1A receptor; SERT, serotonin transporter; MAO-A monoamine oxidase-A; BPND, nondisplaceable binding potential; VT, volume of distribution