Abstract

This paper is about the efforts the norwegian psychologist Jan Smedslund made in analyzing and checking philosophically his theory called ‘Psycho-logic’. I am going to reconstruct and discuss the debates between Smedslund and several critics, which have been going on since about 1978, mainly in the “Scandinavian Journal of Psychology”. A result will be that the kind of modal logics Smedslund uses — a type with realistic semantics and epistemology — is not the proper one for the analysis of ‘Psycho-logic’