Article révisé par les pairs
Résumé : In 25 cats which had undergone a section at different levels of the pons, arterial hypertension provoked by temporary obstruction of the low thoracic aorta led to an electrocortical activation associated with pupillary dilatation. Such reactions were not observed in 3 cats with a section at the mesencephalic level. The mechanism of activation is attributed to a physicochemical disorder which influences the reticular formation through the medium of certain hypothalamic neurons.