par Carels, Guy 
Référence Electroencephalography and clinical neurophysiology, 14, 5, page (714-723)
Publication Publié, 1962-10
Référence Electroencephalography and clinical neurophysiology, 14, 5, page (714-723)
Publication Publié, 1962-10
Article révisé par les pairs
| Résumé : | 1. 1. The driving of the occipital rhythms by flickering light shows, for frequencies of stimuli exceeding 5-6/sec, an inertia which is characterized by a latency which often lasts for a very long time, by the slow and gradual increase in the amplitude of successive responses, and by the transitory persistence of the reactive potentials after the photic stimulation has ceased. 2. 2. This inertia can be decreased significantly by a blocking reaction (opening and closing of the eyes) which immediately precedes the flicker. The facilitation observed in this seems to be of reticular origin. 3. 3. The flattening which follows the arrest of the flicker, immediately precedes the reappearance of the alpha rhythm and also corresponds to a dynamogenic phase of the occipital 4. 4. The opening and closing of the eyes during flicker suppresses the driving of the occipital potentials, recalling the classical blocking reaction of the alpha rhythm. 5. 5. Sensory stimuli, other than visual ones, and mental work considerably depress the occipital driving, and sometimes for a long time, when they are superimposed on photic stimulation. The persistence of this depression contrasts with the important degree of facilitation which is observed after a blocking reaction due to the opening and closing of the eyes provoked during flicker. These two modes of reaction suggest that the suppression of the occipital driving by stimuli other than visual ones, could be due to a process of active inhibition, as opposed to the classical activation by acceleration-desynchronization caused by opening the eyes. 6. 6. The observations describes above are discussed in terms of recent data obtained by experiments done on animals. © 1962. |
