title: A blood flow increase to a visual stimulus in the occipital lobe of the cat with brainstem transection at the pretrigeminal level.
abstract: The effects of visual stimulation on the cerebral blood flow were studied in pretrigeminal cats. The visual stimulus was a feather duster which was moved for 4-5 min in front of the cats eyes. The cerebral blood flow was measured each 15 min with [133]Xe clearance method in the left occipital lobe. The visual stimulation evoked an increase of the cerebral blood flow which was accompanied by an ocular following movements and a cortical EEG desynchronization. The arterial blood pressure was unchanged. All these responses habituated rapidly when the stimulus was repeated at 15 min intervals. A similar increase of the cerebral blood flow was obtained by 9 percent CO2 inhalation. The administration of amphetamine increased the cerebral blood flow, whereas Nembutal decreased it. The visual stimulus evokes an increase of the cerebral blood flow in a condition when the lower brainstem is separated from the cerebrum.
mesh_terms: D000661:Amphetamine / Q000494:pharmacology; D000818:Animals; D001933:Brain Stem / Q000502:physiology*; D002245:Carbon Dioxide / Q000494:pharmacology; D002415:Cats; D004569:Electroencephalography; D004585:Electrooculography; D009778:Occipital Lobe / Q000098:blood supply*; D010424:Pentobarbital / Q000494:pharmacology; D014785:Vision, Ocular; D014796:Visual Perception / Q000502:physiology*
chemical_list: D002245:Carbon Dioxide; D000661:Amphetamine; D010424:Pentobarbital