Correlate of Surface Electroencephalogram (EEG) With Implanted EEG Recordings (ECOG)

Inclusion Criteria:

   - Male or Female subjects 18 years of age or older.

   - English or Spanish Speaking

   - Subjects who have been previously diagnosed with intractable epilepsy and require
   implantation of invasive electrophysiological recordings as part of their routine
   clinical presurgical workup.

Exclusion Criteria:

   - Patients with skin abnormalities at the planned application sites that would interfere
   with sensor or electrode applications.

   - Patients with pre-existing conditions and/or co-morbidities that would prohibit them
   from participating in the study due to unacceptable risks to their health and
   well-being, as determined by the Principal Investigator (PI).

   - Patients who the PI deems ineligible at the PI's discretion

   - Pregnant patients