Analysis of information sources in references of the Wikipedia article "Unconscious mind" in English language version.
Ellenberger, in his classic 1970 history of dynamic psychology. He remarks on Schopenhauer's psychological doctrines several times, crediting him for example with recognizing parapraxes, and urges that Schopenhauer "was definitely among the ancestors of modern dynamic psychiatry." (1970, p. 205). He also cites with approval Foerster's interesting claim that "no one should deal with psychoanalysis before having thoroughly studied Schopenhauer." (1970, p. 542). In general, he views Schopenhauer as the first and most important of the many nineteenth-century philosophers of the unconscious, and concludes that "there cannot be the slightest doubt that Freud's thought echoes theirs." (1970, p. 542).
'the theory of the unconscious' [...] was already available as an idea [seed] from the beginning of the nineteenth century [...] in the writings of the philosophers Schopenhauer, von Hartmann and Carus[.]
'the theory of the unconscious' [...] was already available as an idea [seed] from the beginning of the nineteenth century [...] in the writings of the philosophers Schopenhauer, von Hartmann and Carus[.]
'the theory of the unconscious' [...] was already available as an idea [seed] from the beginning of the nineteenth century [...] in the writings of the philosophers Schopenhauer, von Hartmann and Carus[.]