PRISM Neurofeedback Training for MDD Anhedonic Patients

During the study, participants will perform the following: * Complete clinical assessments using questionnaires, an MRI scan, and tasks that probe reward responsivity, learning, and motivation. * Perform at least 10 sessions but optimally 15 (+/-3) neurofeedback training sessions (performed twice a week on nonconsecutive days for 5-8 weeks). * Complete the same clinical assessments, post-NF training MRI scan, and tasks same as in the screening/baseline stage. Researchers will compare the sham and treatment arm to evaluate if the neurofeedback effect reduced MDD symptoms in MDD patients with Anhedonia.