23 A little bit of history
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Experimental psychology evolved in 19th century Germany. Figure 23.1 shows three of the key scholars involved.
Before the advent of experimental psychology, psychological theorising had been the purview of philosophers. Unfortunately, while coming up with some ideas highly relevant to psychology (see, e.g., John Locke, David Hume and John Stuart Mill), they were not interested in testing their ideas empirically.
In 19th century Germany, the physiologists mentioned above1, among others, took a different approach and started to perform experiments to empirically test ideas relevant to the nascent field of psychology.
Among his many other contributions to science, in 1849 von Helmholtz measured neuronal conduction speeds and showed that, while neuronal conduction was fast (about 25 to 40 m/s in frog neurons), it was not so fast that it could not be measured.2 This insight opened the door to investigating the human mind by measuring the time it took to complete certain tasks.
Fechner on the other hand, building on the work of Ernst Heinrich Weber, established the field of psychophysics.
And, in 1879, Wundt founded the first psychological institute in the world at the University of Leipzig. According to Boring (1950), he should be considered the first psychologist.
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References
Notably, Fechner, von Helmholtz and Wundt had all studied medicine, not philosophy. That said, they were not just physiologists or psychologists. Boring (1950) notes that Fechner “was for seven years a physiologist (1817-1824); for fifteen a physicist (1824-1839); for a dozen years an invalid (1839 to about 1851); for fourteen years a psychophysicist (1851-1865); for eleven years an experimental estheticist (1865-1876); (…) recurrently and persistently a philosopher (1836-1879); and finally, during his last eleven years, an old man whose attention had been brought back (…) to psychophysics (1876-1887)” (p. 283). Von Helmholtz was also an eminent physicist. And Wundt was also a philosopher.↩︎
Even Johannes Müller, one of the most eminent physiologists of the time, was of the opinion that neuronal conduction speeds must be so fast they cannot be measured (Cobb, 2020).↩︎