1. A system, comprising: one or more near infrared sources configured to emit infrared radiation onto a portion of a cortical region of a person; one or more detectors configured to receive infrared radiation indicative of a level of oxygenated hemoglobin and a level of deoxygenated hemoglobin in the portion of the cortical region; the system further comprising a feedback source configured to provide feedback to the person based on one or more of the level of oxygenated hemoglobin and the level of deoxygenated hemoglobin in the cortical region; and the system comprising a processor configured to correlate a change in the one or more of the level of oxygenated hemoglobin and the level of deoxygenated hemoglobin with a change in the feedback, the feedback being changed when a change in the one or more of the level of oxygenated hemoglobin and the level of deoxygenated hemoglobin is above a threshold value.