John John

Schizophrenia has attracted more than its fair share of evolutionary-based theories. The theories involving balancing selection are based on the assumption that the incidence of schizophrenia is invariant across time and place. Modern epidemiology allows us to reject this dogmatic belief. Once variations in the genetic and epidemiological landscape of schizophrenia are acknowledged, more productive research models can be generated. (Published Online November 9 2006).

Examples growing out of the Newcomb problem have convinced many people that decision theory should proceed in terms of some kind of causal probability. I endorse this view and define and investigate a variety of causal probability. My definition is related to Skyrms' definition, but proceeds in terms of objective probabilities rather than subjective probabilities and avoids taking causal dependence as a primitive concept