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Objective knowledge out of ignorance: Popper on body,mind, and the third world
Authors:Herbert Keuth
Institution:(1) Faculty of Social Sciences, University of Mannheim, Mannheim, Germany
Abstract:In the fifties, Popper defended an interactionistic version of body-mind dualism. It distinguished between the world of physical bodies and states and the world of ldquomental statesrdquo. Later he added a third world of ldquoobjective thought contentsrdquo. He claims the assumption that there is the third world is a necessary presupposition of problem-solving in general and of his philosophy of science in particular. The present article contains separate reasonings to the effect that this presupposition is neither necessary nor even possible. It is further argued that postulating the existence of entities makes sense only relative to a criterion of ontological commitment, which Popper does not mention and obviously does not have, and that in addition it presupposes a theory, which is tentatively accepted as true and which according to the criterion implies the existence of the entities. But as yet there is no testable theory involving terms like ldquomindrdquo, ldquointentionrdquo etc., which made the notion that itself or its terms are essentially different from what is already known in the empirical sciences at least plausible. Therefore the body-mind controversy is still pointless. Popper's stand on it seems to be but a reflex of his anti-behavioristic and anti-psychologistic attitude.
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