The term 'schizophrenia' refers to a group of disorders that have been described in every human culture. Two apparently well established findings have corroborated the need for an evolutionary explanation of these disorders: (1) cross-culturally stable incidence rates and (2) decreased fecundity of the affected individuals. The rationale behind this relates to the evolutionary paradox that susc...

• Wiring for Wheel II corrected. • Mentioning of double stepping anomaly added to chapter 1.3 and 1.4. • Sizes in 2nd drawing on page 22 corrected. • Some minor corrections of text and typos. • Apendix A-E removed.