Methods of treating language, behavioral and social disorders are described, including methods of treating language disorders associated with electrographic abnormalities in the primary or associative language cortex of persons with autism spectrum disorders, pervasive developmental delay or acquired epileptic aphasia. A language, behavioral and social disorder may be treated by detecting epileptiform activity or an electrographic seizure for a subject's brain and applying neurostimulation to a language cortical region of the subject's brain (e.g., a primary or associative language cortical region). Detection of epileptiform activity or an electrographic seizure and stimulation of language cortex may be performed by a sensing and/or stimulation electrode that is inserted into a subject's brain and connected to one or more neurostimulation devices for monitoring and/or stimulating the language cortex.