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PubMedDate not supplied

[Effect of gamma-aminobutyric acid on audiogenic seizures and conditioned reflexes in the rat].

The influence of GABA injection (intraperiotoneal) on the sensitivity to sound and behaviour was studied on KM line rats, in which a strong sound produces epileptiform seizures, and on sound-resistant Wistar line rats. It was shown that in the KM line rats the previously elaborated motor alimentary conditioned reflex was impaired for several hours after the seizures. The two first GABA injections to the rats of both lines reduce the number of adequate reactions to a signal stimulus. As GABA injections are repeated, conditioned activity is restored. A four-time GABA injection results in blocking of the audiogenic seizures in a number of rats of the KM line and in the maintenance of normal behaviour after the action of the epileptogenic stimulus.

Acoustic Stimulation↗
PubMed1990

[The inhibitory effect of the presentation of extraneous stimuli on the neuronal impulse reactions of the cat parietal cortex in a conditioned reflex].

Spike activity of neurons (area 7) was studied during conditioned placing reflex in the rest, during appearance and extinction of the orienting reaction in trained cats. Spike activity was studied also during unconditioned electro-cutaneous stimulation of the contralateral forelimb in untrained cats. Conditioned movements and electrocutaneous stimulation occurred without specific spike reactions of neurons due to the effect of the external stimulation on attention of animals. It is suggested that appearance of spike responses of neurons to the stimulation only reflects the processes in structures that take part in the triggering and realization of the reflex.

Animals↗
PubMedDate not supplied

[Correlation between the retention of defensive conditioned reflexes and rat brain acetylcholinesterase activity].

The comparison of the characteristics of temporary connection retention (repeated elaboration) with the activity of acetylcholinesterase (AChE) of the motor, visual cerebral cortical areas and hippocampus was done at different time (1, 2 and 4 weeks) following elaboration of defensive conditioned reflexes (CR) in rats in a chamber of two-way avoidance with electrified floor. The maximal retention of CR was observed 2 weeks after the initial elaboration. The dynamics of AChE activity on the whole doesn't correspond to the changes in CR retention. Pronounced AChE activity decrease in the motor and visual cortex was observed during CR reproduction 4 weeks after elaboration. Significant differences by this parameter were observed between trained animals and the rats, presented with non-paired photic and electrical stimuli (active control).

Acetylcholinesterase↗
PubMed2006

Konorski and conditional reflexes: a historical summary and an addendum.

There have been four major pioneers from Eastern Europe in the neuroscientific study of memory and learning: Pavlov, Bekhterev, Beritashvili and Konorski. The thinking of each evolved with the progress of neuroscientific knowledge throughout the world, and save for Pavlov, each encountered governmental opposition to their views. Among the clues largely overlooked in their examination of conditional reflexes was the fact that the animal appreciates not only its own appetitive state but its immersion in the experimental setting. The latter in itself must require considerable, ongoing neuronal activity to sustain it. There is also the question as to whether "motivation" is an essential feature for the formation of conditional connections; and in cases where it is seemingly absent, as in recognition memory, the processes that underlie the astonishing efficacy of such memory formation remain almost wholly obscure. Finally, it is remarked that the cerebral cortex, as initially supposed, may indeed be the governing locus, even of such simple effects as habituation.

Association Learning↗