1. A method for treating a patient, comprising: obtaining first imaging information corresponding to a first region of a patient's brain, the first imaging information being based at least in part on functional characteristics of the first region; obtaining second imaging information corresponding to a second region of the patient's brain, the second region being a subset of the first region, the second imaging information being based at least in part on functional or structural characteristics of the second region; selecting a target neural population based at least in part on the second imaging information; and applying an electromagnetic signal to the target neural population to improve a patient function; wherein obtaining first imaging information includes obtaining first imaging information of the patient's middle frontal gyrus.