Abstract: Biofeedback devices, systems, and methods for training enhanced performance are provided. A subject's EEG activity can be measured and analyzed, and a feedback signal can provide ongoing, continuous information regarding the subject's success in maintaining the brain's activity within a predetermined, desired state of enhanced performance. There are specific EEG patterns that maintain states of enhanced performance. The differential reduction and enlargement of the amplitudes of the various frequencies at specific sites that produce states of enhanced performance are measured. For example, enhanced performance can be produced when theta activity (4-8 Hz) and low-alpha activity (8-10 Hz) are maintained below a low-activity threshold while maintaining gamma activity (38-42 Hz) above a performance threshold amplitude (e.g., 0.5 microvolts). Additionally, positive feedback can also be withheld unless the subject maintains high-alpha activity (11-13 Hz) above a staging threshold value.