Systems and methods for treating cognitive dysfunction and/or depression using transcutaneous auricular neurostimulation therapy may include positioning a wearable neurostimulation device about the ear of the patient, connecting the wearable neurostimulation device, to a pulse generator, and delivering a first series of stimulation pulses to at least one first electrode, the first series being configured to increase monoamine neurotransmitter availability, and delivering a second series of stimulation pulses to at least one second electrode, the second series being configured to upregulate opioid receptor agonists.