The "normal" undisturbed function of the brain is associated with a rapid interplay of excitation and inhibition of the nerve cells. This seeming chaos of constant changes in activity is subject to differentiated control systems of the nervous system.
During an epileptic event, this natural interplay is disturbed in a diffuse (both cerebral hemispheres affected) or focal (regionally circumscribed) manner – in such a way as to result in a consonance (synchrony) of the excitation processes; a large proportion of the nerve cells is stimulate simultaneously. This results in a sort of bundling, a simultaneous, collective, ‘electrochemical alignment’ of the nerve cells, an "ordering". Moreover, since this ‘simultaneously switched on’ excitation is stronger than usual (‘Hyper-synchrony’), the overall process doubly abnormal and dangerous for the brain; the brain is unable to cope with this overload and reacts with an epileptic fit, that, in physicochemical terms, is equivalent to a colossal, bundled discharge (similar to the electric discharges [lightning bolts!] in a storm in the natural world).
