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...