[Effect of the motivation factor on the utilization by animals of prior experience in an altered learning situation].

At studying the use by the rats of previous experience in conditions of change of the dominant need and change of learning situation, data were obtained that allowed to evaluate differently the significance of drinking and defensive motivations as a factor providing for dissociated learning of animals. Significance is discussed of motivation factor during the use by the rats of one or other behavioural strategies in the process of learning.

[Ontogenetic features of the development of evoked potentials in the visual cortex of the alert rabbit].

Formation of optical EPs was studied in alert rabbits during postnatal ontogenesis. The pathways of the transmission of light stimuli to the brain cortex were found to develop heterogeneously causing the EPs to have different forms in the early stages of ontogenesis.

[Effect of destruction of the hippocampus and septum on learning in the rat in "negative transfer" situations].

Intact rats and rats with lesions of the hippocampus and septum were trained to repeated switching-over of the habit of choosing the reinforced side of the maze as well as to alternation of reinforced side choice. Repeated switchings-over of the habit impedes the subsequent elaboration of the choice alternation ("negative transfer"). In operated animals, the interferating effect of the previous experience is more expressed.