Dementia praecox occupies a foundational, contested position in the depth-psychology corpus. Introduced systematically by Kraepelin as a prognostically coherent disease-entity defined by poor outcome, the concept was radically transformed by Eugen Bleuler's 1911 monograph, which proposed renaming and reconceptualizing the condition as 'schizophrenia' — from the Greek for 'split mind' — on the grounds that the splitting of psychic functions, not intellectual deterioration, constitutes the disease's essential character. Bleuler's reformulation established fundamental symptoms (associative loosening, ambivalence, autism, affective flattening) as diagnostically primary, demoting hallucinations and delusions to accessory status. Jung, whose early Burghölzli work directly preceded Bleuler's monograph, pursued the psychogenetic thread: his 'Psychology of Dementia Praecox' (1907) argued that complex-constellations with powerful affective charge underlie the symptom-formation, positioning the condition as psychologically intelligible rather than purely organic. Karl Abraham pressed further the libido-economic dimension, arguing that dementia praecox destroys the capacity for object-love through a regression antecedent to any transference. The corpus thus presents dementia praecox as simultaneously a nosological problem (how to delimit the disease), a psychogenetic problem (what role affect and complex play), and a theoretical fulcrum around which competing models of libido, regression, and psychosis were elaborated.
I call dementia praecox 'schizophrenia' because (as I hope to demonstrate) the 'splitting' of the different psychic functions is one of its most important characteristics.
Bleuler formally proposes replacing 'dementia praecox' with 'schizophrenia,' grounding the renaming in the claim that psychic splitting, not deterioration, is the disease's defining feature.
, Dementia Praecox or the Group of Schizophrenias, 1911thesis
It is not yet clear just what sort of entity the concept of dementia praecox actually represents. It probably includes one or very few diseases, in the narrower sense, which constitute the major portion of cases.
Bleuler acknowledges the unresolved nosological status of dementia praecox while defending its utility as a disease-entity distinguished by constant fundamental symptoms.
, Dementia Praecox or the Group of Schizophrenias, 1911thesis
Dementia praecox comprises the majority of psychoses heretofore designated as functional. This very idea implies a special systematic conception of mental diseases.
Bleuler situates dementia praecox as the dominant category among functional psychoses, requiring a revised systematic nosology grounded in Kahlbaum's disease-concept model.
, Dementia Praecox or the Group of Schizophrenias, 1911thesis
The variability of the external clinical picture of this disease has been the greatest obstacle to the acceptance of the idea. However, since it was proven that there exist certain constant symptoms and that the changing ones are of no systematic significance
Bleuler defends the unity of the dementia praecox concept against objections from clinical variability by distinguishing constant fundamental symptoms from variable accessory ones.
, Dementia Praecox or the Group of Schizophrenias, 1911thesis
dementia precox destroys the person's capacity for sexual transference, i.e. for object-love.
Abraham advances a psychoanalytic-libidinal thesis, arguing that dementia praecox is distinguished from other conditions by a fundamental regression that obliterates the capacity for erotic object-relations.
, Selected Papers on Psychoanalysis, 1927thesis
She had kept alive the vision of him with those movements. This was my first inkling of the psychogenesis of dementia pr[aecox].
Jung recounts the clinical observation that fixed stereotyped movements in a chronic patient encoded an unfulfilled erotic attachment, identifying this as his earliest evidence for a psychogenic origin of dementia praecox.
, Analytical Psychology: Notes of the Seminar Given in 1925, 1989thesis
Freud broaches the question of whether the loss of reality in schizophrenia, to which I drew attention in my 'Psychology of Dementia Praecox,' is due entirely to the withdrawal of erotic interest, or whether this coincides with objective interest in general.
Jung situates his own earlier work on reality-loss in dementia praecox within the Freudian debate on libido-withdrawal, pressing toward a broader conception of interest that exceeds exclusively erotic cathexis.
, Collected Works Volume 1: Psychiatric Studies, 1902supporting
Kraepelin finally succeeded in isolating a number of symptoms which were present in maladies with very poor prognoses while absent in other disease-groups.
Bleuler credits Kraepelin with the decisive prognostic isolation of dementia praecox as a disease-group, providing the historical foundation upon which Bleuler's own symptomatic reformulation is built.
, Dementia Praecox or the Group of Schizophrenias, 1911supporting
all authorities tend to consider schizophrenias as poisoning or some similar novum of the body. In that case, the disease should be placed alongside the paresis group and it ought not to show any transitions to other diseases.
Bleuler surveys the prevailing somatic hypothesis — that schizophrenia results from toxic or organic process — and notes its implication for nosological boundaries between the disease and other psychoses.
, Dementia Praecox or the Group of Schizophrenias, 1911supporting
It is customary to use the term 'dementia' for this condition. But the same expression is used for the condition that follows on other psychoses... The two conditions are in reality of quite a different nature.
Abraham challenges the terminological conflation of dementia praecox with other dementias, insisting that the apparent intellectual diminution in dementia praecox differs in mechanism and nature from organic deterioration.
, Selected Papers on Psychoanalysis, 1927supporting
the symptoms (delusions, hallucinations, insane ideas) stand in close relation to these psychological antecedents. They in fact, as Freud has shown, determine the symptoms.
Jung's early experimental research identifies feeling-toned complexes rooted in psychic antecedents as the determinants of psychotic symptoms, providing empirical grounding for a psychological approach to dementia praecox.
, Experimental Researches, 1904supporting
Dementia praecox H.~ Dementia praecox v. Imbecility E. Moral insanity K. ~ Dementia praecox K.'" Dementia praecox A. Paranoia B. Psychopathy s. Catatonia
Jung's association experiment data present dementia praecox cases alongside other diagnostic categories, enabling comparative psychophysical profiling that supports the distinctiveness of the condition's associative disturbances.
, Experimental Researches, 1904supporting
only seven of the eleven cases of dementia praecox appear, for in the others the waves were so slightly marked or so uncertain that the facts could not be satisfactorily determined.
Jung's galvanometer-pneumograph investigations document characteristic irregularities in psychophysical responsiveness among dementia praecox patients, contributing to the empirical differentiation of the condition.
, Experimental Researches, 1904supporting
dementia praecox, 252, 328, 42 47 4[, 6 ; association in, 547-53; complexes in, 602; dreams in, 395[; galvanometer and pneumograph experiments in, 496, 514-24
The index of Jung's Experimental Researches maps the extensive range of investigative approaches applied to dementia praecox, including association studies, complex analysis, dream investigation, and psychophysical measurement.
, Experimental Researches, 1904supporting
catatonia as a disease process has never disappeared from the literature although it was often vigorously attacked. Only a few authors accepted the concept of catatonia as a 'disease process,' the majority of German psychiatrists rejected it
Bleuler traces the contested reception of catatonia — a sub-type later incorporated into dementia praecox — revealing the nosological struggles that preceded Kraepelin's and Bleuler's own syntheses.
, Dementia Praecox or the Group of Schizophrenias, 1911supporting
In dementia praecox we have a different kind of associative disturbance, as well as a typical affect disturbance.
Bleuler distinguishes dementia praecox from idiocy, paranoia, and epilepsy by specifying its dual pathological signature: a characteristic form of associative loosening combined with a distinctive flattening of affect.
, Dementia Praecox or the Group of Schizophrenias, 1911supporting
the emotions of the unconscious, roused up by questions or words that strike into the buried complexes of the soul, reveal themselves in the galvanometer curve, while the pneumographic curve is comparatively unaffected.
In reporting galvanometric findings from an acute catatonia case, Jung theorizes that unconscious complex-activation is registered physiologically, linking the experimental method to the deeper psychogenetic thesis.
, Experimental Researches, 1904aside
the displacement of libido is based on the everyday use of the term, its original, purely sexual connotation being very rarely remembered.
Jung reflects on the broadened clinical usage of 'libido' in relation to the reality-loss characteristic of schizophrenia/dementia praecox, situating the Freud–Jung theoretical divergence within the problem of psychotic withdrawal.
, Collected Works Volume 4: Freud and Psychoanalysis, 1961aside