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[Role of amygdalar nuclei in alimentary and defensive conditioned reflexes in the rat].

Ninety experimentally naive male white rats were divided into groups with lateral (AL), medial (AME) and central (ACE) amygdalar nuclei lesions, sham-operated and normal controls. The AL-rats showed a facilitation of instrumental conditioned alimentary reflexes (CAR) acquisition and retardation of initial avoidance learning in a shuttle box; the AME-rats exhibited a slower acquisition of the CAR and a facilitation of avoidance conditioning; in the ACE-rats acquisition of the CAR was the same as in controls but avoidance performance was significantly impaired as compared with all experimental groups. It has been assumed that functional non-identity of the amygdalar nuclei in alimentary and avoidance behaviour is caused by dominant drive and by presence of "specific" amygdalar neurones participating in functional systems of the studied behavioural reactions.

Amygdala↗
PubMedDate not supplied

[Reflection of the process of conditioned reflex formation in shifts of the steady potential level].

In chronic experiments on rabbits with non-polarizable electrodes shifts of steady potential level (SPL) are recorded from the brain surface during extinction of the orienting reaction and formation of a conditioned defensive reflex. During each of these processes they have their typical parameters and are respectively denoted by the author as: orienting (appearing in response to a new stimulus), conditioned (to a signal atimulus), unconditioned (to an electro-cutaneous stimulus) and trace SPL shifts (developing after stimuli pairing). Trace shifts are the earliest SPL shifts originating as a result of pairing. They are manifested more regularly, than conditioned ones, considerably exceed them in amplitude, may differ from them in their sign and reach maximum values in a few seconds after the pairing. It has been assumed that formation of conditioned temporal connections depends above all on the appearance of a new kind of activity, resulting from pairings and reflected in the SPL trace shifts. This activity possibly constitutes the neurodynamic and metabolic processes underlying memory consolidation.

Animals↗