Abstract Correlation between immobility reflex and electrocortical after-discharges in rabbits. In each experimental session, the immobility reflex was elicited by inversion of the rabbit and afterward three electroshocks were applied at 15-min intervals. A significant negative semilogarithmic correlation between the duration of the immobility reflex and the average duration of the electrocortical afterdischarges was observed during the first two experimental sessions. In subsequent sessions such correlation disappeared. It was postulated that the inhibitory processes responsible for the immobility reflex, and those responsible for postepileptic extinction, could initially share some neural mechanisms, but with repetition, they become independent of each other.