Inclusion Criteria:  We will screen with UNMH EEG database, Nihon Kohden Neuroworkbench first. After meeting all the inclusion and exclusion criteria, we will access the Cerner Powerchart (UNMH EMR) for the rest of the clinical information. 18 years old or older. If the patient's age is over 89, we will aggregated them to age 90 or older so that the patient cannot be identified. Also, all the EEG data will be de-identified and only show the year of the study performed instead of the exact study date to reduce the risk of identification. Of note, we perform over few thousands of EEG studies per year and it will be almost impossible to identify the patient based on the study year.  Exclusion Criteria:  Children under age of 18 years old will be excluded. Mismatched patients between EEG database and EMR