Abstract

The ongoing incidence of schizophrenia is considered a paradox, as the disorder has genetic basis yet confers survival handicaps. Researchers have not reached consensus regarding theories explaining this contradiction. Major evolutionary theories hypothesize that schizophrenia is: a byproduct of other evolutionary processes, linked to survival advantages that counteract disadvantages, associated with processes such as shamanism conferring advantages to groups, a consequence of modern environments, a result of random processes, such as mutations. A null hypothesis argues that philosophical or methodological problems render evolutionary paradigms inappropriate. These arguments are reviewed in light of an experience-centered approach, which regards experiential accounts as data. A ritual healing theory, derived from this orientation, has bearing on evolutionary theories pertaining to schizophrenia. This theory explains the nature of shamanism, which has features coinciding with schizophrenia. The ritual healing theory is supported by folklore, medical, and anthropological evidence, is amenable to empirical evaluation, and has clinical applications