[A comparative analysis of spatial orientation in a changing environment in rats with differing preliminary experience].

Comparison of rats behaviour with different preliminary experience in elaboration of the strategy of return to place of reinforcement was conducted. Significant differences in the number of selective replacements to the place of reinforcement in previous tests in experienced, inexperienced and naive rats were found. It was proved that decisive role in the appearance of the found differences played gained experience and the process of engram extraction from memory. Inhibition of search in naive rats and ability to selective use of strategies corresponding to situation in the experienced ones in condition of stress of permanent changes were shown.