Primary outcome measures will include electrocortical indices under resting and mental task states and will evaluate the degree of neuro-physiological and cortical functional connectivity change following treatment as a proxy measure for neuroplastic response to the GZNT training. Secondary outcomes will include physiological stress response (as an objective measure of emotional regulation), neuropsychological test performance (as an objective measure of cognition), and self-reported symptom and emotional well-being measures. Feasibility outcomes will include number of visits completed within the six weeks, number and reason for drop-outs, adverse event profiles, and patient satisfaction questionnaires.