EEG analysis of epilepsy by directed coherence method. A data processing approach.

Directed coherence (DCOH) was proposed in our previous work as a measure of the correlation between the EEGs of different sites of human brain. In the present research, we applied this method to the interpretation of intrahemispheric information flow in the EEGs of thirteen epileptic patients. This paper discusses the bidirectional communication pattern with DCOH between the frontal and the occipital cortex in the EEGs of epileptics. Comparing with the high values in the alpha-band for the controls, significantly (P < 0.001) small DCOH values were found in the thirteen epileptic patients. The DCOH values of epileptic patients were scattered over the beta-, theta- and delta-bands. This may suggest that the dysfunction of the epileptic brain may be due to an abnormality of the neural networks in the brain.