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Definition theoretical entities: entities that are postulated along with certain them affecting, essential principles to explain regularities within the sensory perception, e.g. like molecules postulated together with the principles of molecular motion.
Theoretical terms: are not defined in behaviorist psychology not only in terms of open behavior, but also not in terms of nerves, synapses, neuron irritation, etc. A behaviorist theory of behavior is not already a physiological explanation of behavior. In order that a structure of theoretical terms is suitable to provide explanations for behavior, the theoretical terms do not have to be identified with the terms of neurophysiology.
Theoretical terms: their logic has two aspects: a) their role in explaining selected phenomena b) their role as candidates for integration into an overall image. Both roles are equal.
E.g. It would be imaginable that the chemistry, before people became aware of electrical or magnetic phenomena, has reached a mature and successful theory of explanation of chemical phenomena. And that some terms that were later connected to the electromagnetic theory, were first introduced by chemists as purely theoretical terms.
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Thinking: the terms belonging to thinking are theoretical terms.
Theoretical entities: it is wrong to assume that they are also individual objects. The role of the comment is ignored.
Der Empirismus und die Philosophie des Geistes Paderborn 1999