Inclusion Criteria:  8 to 21 years old Drug-resistant focal epilepsy Enrolled in the Arkansas Children's Neuroscience Center Comprehensive Epilepsy Program Under evaluation for resective surgery English speakers. This is not a treatment/intervention study.  Exclusion Criteria:  Previous resective surgery for epilepsy Presence of progressive neurodegenerative disorders Presence of significant magnetic artifacts; electronic, magnetic or metallic implants (e.g. pins, screws, shrapnel remains, surgical clips, artificial heart valves, cochlear implants, vascular stents pacemakers); or permanent make-up or tattoos made with metallic dyes Presence of seizures within 24 hours of the MEG Use of sedation during the MEG acquisition Inability to be in a seated or supine position during the tasks Major medical disorders (e.g. HIV, cancer) Significant visual or auditory disabilities Physical disabilities that interfere with accomplishment of study tasks (when applicable) Claustrophobia, or fear of cramped or confined spaces Pregnancy or suspected pregnancy Any condition that the investigator feels might put the patient at risk