Cathodal Transcranial Direct Current Stimulation in Patients With Drug-resistant Focal Epilepsy

Inclusion Criteria: * 18 years and older, * Diagnosed with focal epilepsy with epileptic focus determined according to clinical and electroencephalogram recordings, who have undergone epilepsy surgery but seizures persist, who refuse epilepsy surgery or who are considered unsuitable for surgery, * Patients who comply with the definition of drug-resistant epilepsy according to ILAE (International League Against Epilepsy Classification) criteria (Patients who have failed to achieve long-term seizure-free status despite at least two appropriate antiepileptic drugs given alone or in combination), * Minimum 1 or more seizures per month (minimum 3 months), * No antiepileptic dose change until 3 weeks before the study, stable treatment, and no dose change planned during the study, * At least 1.5 Tesla MR imaging was performed before the study, * Signed the informed consent form or the consent form signed by the legal representative, * EEG was present before the study and all EEG data was accessible, * Cooperative patients who can speak, understand and communicate in Turkish will be recruited. Exclusion Criteria: * The presence of any disease/deformity in the patient that the researchers believe will affect the patient's safety or the reliability of the data to be collected, * Detection of more than one seizure focus in the patient, * The patient had a psychogenic non-epileptic seizure attack (Psychogenic Non-epileptic Seizures -PNES) within 2 years prior to the study, * Having a …