Group Assignment. Participants will then be randomly assigned to the active treatment group or EEG biofeedback control group using a restricted randomization procedure controlling for age, high frequency/low frequency rates, and general health status. Those assigned to the active treatment group will be given ten weekly training sessions in RSA biofeedback, while those in the control group will receive ten weekly sessions of EEG biofeedback starting immediately. All questionnaire and psychophysiological data collected at baseline will be repeated after the last training session 10 weeks later, and at 3 months. At the end of ten weeks, the EEG biofeedback control group participants will be offered the opportunity to participate in the 10-session RSA biofeedback program and subsequent intervention-related assessments (after the last biofeedback session (10th) and at (3 months). The Week 10 assessment, taken at the conclusion of the EEG biofeedback treatment, will serve as the control group's baseline to maintain 10-week pretest/posttest consistency between groups. EEG biofeedback subjects will be compensated only once if they choose to participate in the RSA biofeedback trial.