Fifteen children between the age of 3 and 7 years who had had unilateral seizure followed by a transitory hemiplegia (without fever) were observed. This seizure was the only one in 13 of the children; a second fit appeared in 2 others. The average duration of the observation period was 10 years, 6 months. The evolution of the EEG shows that after a post-ictal delta focus contralateral to the hemiplegia, spike foci of variable localisations were formed in 12 cases. These cases, chosen because of their benign evolution, seem to be related closely to rolandic paroxysmal epilepsy (EPR).