[Effect of successive lesions of the hippocampus and amygdaloid body on conditioned-reflex alimentary reactions in rabbits]. / Vliianie posledovatel'nogo razrusheniia gippokampa i mindaliny na uslovnoreflektornye pishchevye reaktsii u krolikov.

Bilateral electrolytic lesions of the dorsal hippocamp and basolateral amygdalar complex impede the differential and extinctive inhibition. The damage of the corticomedial amygdala against a background of the dorsal hippocamp deficiency facilitates differentiation and extinction of alimentary reflexes induced by a decrease of the alimentary motivation and by weakening of alimentary conditioned reflexes. Lesions of the dorsal hippocamp after the corticomedial amygdala damage facilitates the training of positive alimentary reflexes, but weakens inhibitory conditioned reflexes.

[Differentiation of the intensity of photic stimuli in chickens]. / Differentsirovanie intensivnosti svetovykh razdrazhitelei u kur.

Differentiation of photic stimuli brightness with different brightness ratios was studied in hens by means of food-procuring conditioned reflexes in situation of alternative choice of positive conditioned signal. It has been found that the speed of formation, stability of differentiations and the degree of discrimination of signals by their brightness is in a significant correlation with the ratio of stimuli intensity. Mean speed of elaboration of low (1 : 6.3; 1 : 5.4; 1 : 3.7; 1 : 3.5 and 1 : 3) and medium (1 : 2.75; 1 : 2.55 and 1 : 2) complexity differentiations made 61.62 +/- 12.23 presentations of conditioned signals, and a mean value of differentiation degree made 87.02 +/- 1.35% of adequate choice reactions. Complex differentiations of photic stimuli (1 : 1.75; 1 : 1.5 and 1 : 1.2) were elaborated with difficulty, and the differentiation degree of these signals averaged 53.42 +/- 4.12% of adequate reactions. Differentiation of photic stimuli with 1 : 2 intensity ratio was the limit of brightness discrimination.

[Simultaneous differentiation of visual stimuli in chickens]. / Odnovremennoe differentsirovanie zritel'nykh razdrazhitelei u kur

Differentiation of colour stimuli and geometrical figures was studied in chickens by the food-procuring reflex method with simultaneous presentation of the stimuli. The percentage of correct selections of the positive conditioned stimulus was chosen as a measure of the degree of differentiation. Stable differentiation of colour stimuli appeared after 15.44 +/- 0.6 presentations of the conditioned stimuli reaching 97.66 +/- 0.69% of correct responses. Incomplete differentiation of geometrical figures appeared after 39.07 +/- 3.6 presentations, attaining 67.69 +/- 2.64%. Differentiation of geometrical figures became stable after training, its level rising up to 80.37 +/- 3.89%.

[Formation of chain reaction conditioned reflexes in chickens during different age periods]. / Obrazovanie tsepnykh uslovnykh refleksov u kur v razlichnye vozrastnye periody

The dynamics and mechanism of elaboration of chain instrumental reflexes were investigated in chicks at ontogenesis. It has been established that the older the chicks, the higher the rate of chains synthesis and the longer their preservation. The synthesis of chain conditioned reflexes has been observed since the age of two months, when the inhibitory process, concentration and equilibration of nervous processes are strengthened. The synthesis mechansims of motor reactions are similar in the birds of different ages: at first, the connections of each component of the chain stimulus with the motor reaction are elaborated, then they are replaced by successive connections between the first component of the chain and the whole chain of elaborated reactions. Long training of the chain reflex leads to the development of retardation inhibition and the appearance of a motor reaction to the last component of the chain reflex.