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Hardcover | $34.00 Short | £23.95 | ISBN: 9780262112918 | 344 pp. | 7 x 9 in | 99 illus.| May 2006
Paperback | $30.00 Short | £20.95 | ISBN: 9780262612227 | 344 pp. | 7 x 9 in | 99 illus.| January 2008

The Complementary Nature


Why do we divide our world into contraries? Why do we perceive and interpret so many of life's contraries as mutually exclusive, either/or dichotomies such as individual~collective, self~other, body~mind, nature~nurture, cooperation~competition? Throughout history, many have recognized that truth may well lie in between such polar opposites. In The Complementary Nature, Scott Kelso and David Engstrøm contend that ubiquitous contraries are complementary and propose a comprehensive, empirically based scientific theory of how the polarized world and the world in between can be reconciled. They nominate the tilde, or squiggle (~), as the symbolic punctuation for reconciled complementary pairs.

Experiments show that the human brain is capable of displaying two apparently contradictory, mutually exclusive behaviors at the same time. Coordination dynamics—a mathematically expressed theory that reconciles the scientific language of "states" with the novel dynamical language of "tendencies"—attests to the complementary nature inherent in human brains and behavior. It may explain, Kelso and Engstrøm argue, why we (and nature) appear to partition things, events, and ideas into pairs. Kelso and Engstrøm's account is not just metaphorical; the reconciliations they describe are grounded in the principles and mathematical language of the theory of coordination dynamics. The Complementary Nature provides a clear-cut methodology for this evolving theory of brain and behavior that can also be applied to areas and developments outside the neurosciences, hence aiding reconciliations within and between disparate fields.

About the Authors

J. A. Scott Kelso holds the Glenwood and Martha Creech Chair in Science at Florida Atlantic University and is Founder and Director of the Center for Complex Systems and Brain Sciences.

David A. Engstrøm holds a Ph.D. in Neuropharmacology from the University of Colorado Health Sciences Center. Since 1991, he has worked with Scott Kelso to develop a conceptual link between coordination dynamics and complementary pairs.


"The Complementary Nature is a genuinely fascinating, provocative, and unique book. It rises to the challenge of describing how either/or thinking obscures the in-between dynamic realities that constitute life itself and in turn how these realities rest on complementary rather than oppositional pairs. In the process, it breaks new ground and opens fresh terrain for future research by illuminating ways in which the science of coordination dynamics—from the study of brains to the study of behavior—offers new paths for understanding the nature of human nature."
Maxine Sheets-Johnstone, author of The Primacy of Movement