Philosophy psychology and psychologism : critical and historical readings on the psychological turn in philosophy Psychologism in logic Rolf George Between Leibniz and Mill Carl Posy Psychologism and non classical approaches in traditional logic Werner Stelzner Concept of psychologism in Frege and Husserl J.N. Mohanty Psychologism and sociologism in early twentieth century German speaking philosophy Martin Kusch Space of signs Vincent Colapietro Quinean dreams or prospects for a scientific epistemology Michael Bradie Late forms of psychologism and antipsychologism Joseph Marolis Propositions and the objects of thought Michael Jubien Concepts of truth and knowledge in psychologism John H. Dreher Psychologism revisited in logic metaphysics and epistemology Dale Jacquette Why there is nothing rather than something Paul A. Roth Cognitive illusions and the welcome psychologism of logicist artificial intelligence Selmer Bringsjord and Yingrui Yang