Reproduction of the electrophysiologic correlates of a conditioned defense reflex following electroconvulsive activity]

Acute and chronic experiments on cats have shown the possibility of obtaining in one session conditioned EEG-responses and vegetative changes as well as conditioned motor reactions time-locked to the moment of the unconditioned pain stimulation omitted during testing. Electro-convulsive stimulation directly after elaboration prevents the appearance of conditioned motor reactions, while conditioned EEG and vegetative changes are retained after electric seizures. A conclusion has been drawn that the emotional component of conditioned reactions is not subjected to the amnestic effect of electro-convulsive action.     

Dynamics of acetylcholinesterase activity in the brain during elaboration and stabilization of defensive conditioned reflexes

Electro-defensive condtioned reflexes (CR) to light were elaborated in rats in Y-maze in one experimental session and their training was continued during subsequent 20 sessions. Immediately after CR elaboration or the 20th session of its training, AChE activity in the motor and visual cortex and the hippocampus decreased, increasing again in 24 hours. Animals used as active control which received non-paired photic and electric stimuli, exhibited opposite changes of AChE activity.     

Dynamics of elaboration of a conditioned reflex and differentiations in the snail

It is shown that dynamics of percentage of conditioned food refusals by snails Helix pomatia and Helix lucorum is satisfactorily approximated by regression equation of exponential type with included coefficient reflecting the animals state before the beginning of learning. The ability is established of the snails to practically completely differentiate various alimentary conditioned stimuli. The introduction of differentiation always improved the reflex consolidation. Conditioned reactions to differentiation stimulus appeared at the elaboration stage and were absent at the stage of conditioned reflex consolidation.