[Inhibition with light flashes of negative delta-waves in the rabbit visual cortex].

To elucidate the nature of negative and positive phases of background delta-waves (BDW), their interaction with evoked potentials was studied in the rabbit visual cortex. BDW appeared after injection of drugs synchronizing ECoG: amyzyl, aminozin, barbiturates, and during asphyxia. The flashes evoked slow positive responses lasting about 0.5 to 1.0 s. These responses blocked the negative BDW. The results of the study and published data suggest that background delta-activity consists of segments which reflect the desynchronized state and correspond to positive BDW, and of segments which reflect active inhibition in the cerebral cortex and correspond to negative BDW.