Epilepsy is a neurological condition characterized by recurrent episodes, called convulsive seizures, consisting of sudden and repeated muscle movements, often associated with temporary suspension of the state of consciousness. Seizures are generally of very short duration, although they can sometimes last for a long time, and are the result of an abnormal and prolonged synchronization of the activity of neurons in the cerebral cortex or brainstem. Through the use of an innovative approach, such as the association of EEG and functional magnetic resonance imaging, EEG-fMRI, it is possible to map the specific functional activation of certain brain areas. In particular, this thesis focuses on the study of the interaction between oscillations at different frequency bands.