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Footnotes

1. I would like to gratefully acknowledge my friend and mentor, Paul Gray, whose help, inspiration and guidance in developing these ideas has been constant along an uncertain path. I would also like to thank my advisor and friend Professor Patricia Carpenter whose invaluable experience and insight has helped to transform a loose collection of ideas into a coherent theory. I would also like to thank Carnegie Mellon University and the funding from the National Institute for Neurological Diseases and Stroke (Grant # P01NS35949 to P. Carpenter) for giving me the opportunity to research these ideas.