In text, "protopsychologists" are people who try to link psychological processes to physiological processes. The FIRST protopsychologist was:

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The first protopsychologist was Alcmeon, a Greek philosopher and physician who tried to explain psychological processes in terms of physiological processes in the body. Thales, Plato, and Diogenes were philosophers, but they did not specifically focus on linking psychology and physiology.

In Text, "Protopsychologists" Are People Who Try to Link Psychological