Abstract
In the late 1920s, a unique experiment in human genetics flourished in Moscow at the Institute of Medico-Genetics under the direction of S. G. Levit. As a part of the general program of the institute, a group of psychologists, among whom was Alexander Luria, carried out studies of the mental development of fraternal and identical twins in an effort to understand the interacting roles of heredity and social experience on the development of the mind (for an account of some of this work, see The selected writings of A. R. Luria. White Plains, N.Y.: M. E. Sharpe, 1978).

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