1. A method for automatically predicting and preventing the electrographic onset of a seizure in an individual, comprising the acts of: monitoring a plurality of signals indicative of the activity of the brain of the individual; extracting a set of features from the signals and forming an optimal feature vector; synthesizing a probability vector based on the optimal feature vector as an estimator of the likelihood of seizure for a plurality of prediction time intervals; and preventing the electrographic onset of a seizure by the automatic application of at least one intervention measure that is commensurate with the likelihood of seizure.