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After reading the manuscript, some biologists inquired why, on the basis of the broad experimental material presented in this book, we had not come up with a model describing the operation of the cerebellum. To answer this question, we decided to write a preface to our book. How the nervous system copes with the complexity of the world is one of the central problems of neurophys iology. The question was clearly formulated for the frrst time by N. A. Bernstein. Considering the problem of motor control, he pointed out that the main objective of motor coordination is to overcome the redundant number of degrees of freedom of the motor apparatus or, in other words, to diminish the number of independent variables which control the movement (Bernstein 1967). These I. M. Gelfand and M. L. Zetlin ideas were further developed by (Gelfand and Zetlin 1966). They proposed, in particular, the non-individualized ( non-addressed ) mode of control in complex systems, where only the highest levels of the system have the full notion about the fmal task while the main effectors act on the basis of very limited information. These propositions were made by Gelfand and Zetlin in a very general form, but, nevertheless, proved to be fruitful in determining the direction of experimental research. For instance, the discovery of the locomotory region of the brain stem (Shik et al.
