In the first volume of his
Études cliniques (1852) Morel used the term
démence précoce in passing to describe the characteristics of a subset of young patients, and he employed the phrase more frequently in his textbook
Traité des maladies mentales which was published in 1860. Morel used the term in a descriptive sense and not to define a specific and novel diagnostic category. It was applied as a means of setting apart a group of young men and women who had "stupor." As such their condition was characterised by a certain torpor, enervation, and disorder of the will and was related to the diagnostic category of
melancholia. His understanding of
dementia was a traditional and distinctly non-modern one in the sense that he did not conceptualise it as irreversible state. While some have sought to interpret, if in a qualified fashion, Morel's reference to
démence précoce as amounting to the "discovery" of
schizophrenia, others have argued convincingly that Morel's descriptive use of the term should not be considered in any sense as a precursor to the German psychiatrist
Emil Kraepelin's
dementia praecox disease concept. This is due to the fact that their concepts of dementia differed significantly from each other, with Kraepelin employing the more modern sense of the word, and also that Morel was not describing a diagnostic category. Indeed, until the advent of
Arnold Pick and Kraepelin, Morel's term had vanished without a trace and there is little evidence to suggest that either Pick or indeed Kraepelin were even aware of Morel's use of the term until long after they had published their own disease concepts bearing the same name. As
Eugène Minkowski succinctly stated, 'An abyss separates Morel's
démence précoce from that of Kraepelin.' == Degeneration theory ==