This paper examines the theories of Wilhelm Maximilian Wundt and Franz Clemens Brentano regarding the relationship between the mind's contents and environmental input. It discusses Wundt's concept of psychophysical parallelism, his Selbstbeobachtung method, and his argument that psychology must originate in self-observation rather than external stimuli. The paper then presents Brentano's distinction between inner perception and introspection, and his claim that mental phenomena can only be perceived incidentally. Finally, it notes the shared belief of both thinkers in a fundamental separation between biology and psychology, and briefly addresses the differing historical legacies of each philosopher's work.
Wilhelm Maximilian Wundt and Franz Clemens Brentano were both German philosophers and psychologists working from the 19th into the early 20th century. Much of Wundt's work was discredited by the mid-20th century, in part due to mistranslations of his writings. Brentano, however, had a circle of followers who translated and rewrote his work to such an extent that he was published more after his death than during his lifetime.
Wilhelm Maximilian Wundt (1832–1920) is known as the Father of Experimental Psychology. Practicing exclusively in Germany, he established the first laboratory for psychological research in Leipzig in 1879 (Kim, 2006). Wundt established the Selbstbeobachtung, using a psychological set of procedures and projecting physiology into inner experience. According to Wundt, psychology must begin with self-observation, and the "inner" is immediate; therefore, it can distinguish itself from the "external" (Kim, 2006).
Wundt believed in "psychophysical parallelism", in which the mind and physiology are independent from each other (Macnamara, 1999, p. 204). In Wundt's schema, there is no causal relationship between the two; rather, "psychic causality" explains the cognitive or mental life and processes, while "physiological causality" explains the physiological life and processes (Macnamara, 1999, p. 204). As such, Wundt believed that psychology's major areas could not be studied through the introduction of external or environmental input (Macnamara, 1999, p. 210). He further argued that when we focus on a mental phenomenon, we actually focus on our recollection of that phenomenon rather than the phenomenon itself (Macnamara, 1999, p. 215).
Franz Clemens Brentano (1838–1917) was a philosopher and psychologist who also practiced in Germany (Huemer, 2010). Brentano drew a distinction between "inner perception" or "intuition" — which he regarded as the primary guide to understanding psychological perception and cognition — and "introspection," which he considered illusionary (Macnamara, 1999, p. 218). Brentano believed that we can never directly focus on mental phenomena; rather, it is only when we stop focusing on mental phenomena and turn our attention to the external world that we can incidentally perceive the mental phenomena (Macnamara, 1999, p. 215). Both Wundt and Brentano held that there is a "fundamental distinction between biology and psychology" (Macnamara, 1999, p. 200).
Wundt and Brentano drew sharp distinctions between the mind acting on itself and the mind's contents and input from the environment. Drawing a distinct division between biology and psychology, they believed that there is no causal relationship between the mental life and the physiological life. Though Wundt is known as the Father of Experimental Psychology, much of his work was discredited, at least partly due to mistranslation. Brentano's work was preserved and protected by accurate translations and rewrites carried out by a circle of devoted followers both during and after his death.
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