[Physiological and genetic ways of studying the extrapolation capability of mice].

Elementary reasoning--the ability of mice to extrapolate the direction of alimentary stimulus movement--was investigated in gentically different groups of animals. It was shown that mice possessing. Robertsonian translocation Rb(8,17) 11EM were superior in the extrapolation task solving than mice with normal kariotype, or mice with Robertsonian translocations of other types (RB(5, 19)1Wh, Rb(6, 15)1ALD, Rb(9, 14)6Bnr, Rb(16, 17)7bnr). Mice selected for low brain weight were superior in the extrapolation task solving than mice with high brain weight in 3--11 generations of selection. In F12--F14 this difference was absent. Mice with Robertsonian translocations and mice selected for brain weight are perspective models for physiological and genetic study of elementary reasoning.