While he did not publish much in English, the fifteen lectures he gave to the Harvard Medical School between 15 October and the end of November 1906 were published in 1907 as The Major Symptoms of Hysteria, and he received an honorary doctorate from Harvard in 1936.
The word subconscious is an anglicized version of the French subconscient as coined by the psychologist Pierre Janet, who argued that underneath the layers of critical thought functions of the conscious mind lay a powerful awareness that he called the subconscious mind.
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Nevertheless he had established his name internationally in the field, Morton Prince for example stating in 1904 that "certain problems in subconscious automatism will always be associated with the names of Breuer and Freud in Germany, Janet and Alfred Binet in France".
Formerly known as "hysteria", the disorder has arguably been known for millennia, though it came to greatest prominence at the end of the 19th century, when the neurologist Jean-Martin Charcot, physician and personality theorist Sigmund Freud and psychiatrist Pierre Janet focused their studies on the subject.
Ey developed an organodynamic psychology and a theory of the structure of states of consciousness, in which he developed ideas of Pierre Janet and John Hughlings Jackson.
During this creative phase Baldwin travelled to France (1892) to visit the important psychologists Charcot (at the Salpêtrière), Hippolyte Bernheim (at Nancy), and Pierre Janet.