text: This thinker distinguished between "inner" and "outer" word associations, and used tension vs. relaxation as one of three dichotomies in his tridimensional theory of feeling.
full_question: This thinker distinguished between "inner" and "outer" word associations, and used tension vs. relaxation as one of three dichotomies in his tridimensional theory of feeling. This psychologist created a theory where the objects of "apprehension" must be focalized using the process of "apperception." Following the work of Donders, this man measured how long it takes to differentiate two stimuli, as part of his extensive experiments on reaction time. This man originated the method of "introspection" as part of his psychology of "voluntarism," contrasted with the "structuralism" of his student Edward Titchener. This author of Principles of Physiological Psychology founded a lab in Leipzig after studying under Hermann von Helmholtz. For 10 points, name this German founder of experimental psychology.
first_sentence: This thinker distinguished between "inner" and "outer" word associations, and used tension vs. relaxation as one of three dichotomies in his tridimensional theory of feeling.
raw_answer: Wilhelm Wundt