In the 1800s physicians studying the disorder we now call schizophrenia used the term _________________ because they observed that the onset of symptoms often occurred before adulthood.

Question

BlackTom AI · Accepted Answer

Dementia praecox literally means "premature dementia" and was the historical term clinicians used because they observed an early, often adolescent or young-adult onset with a progressive deteriorating course.

1) Relevant knowledge points and concepts
- Emil Kraepelin (late 1800s) characterized a group of psychotic disorders by early onset and chronic deterioration and labeled it dementia praecox.  
- The term emphasizes onset before full adulthood and a decline in cognitive and social functioning resembling dementia, but occurring at a much younger age.  
- Eugen Bleuler later (1908) introduced the term schizophrenia to replace dementia praecox, recognizing different symptoms and variable courses.

2) Step-by-step reasoning
- Physicians in the 19th century noted psychotic symptoms beginning in adolescence/young adulthood.  
- They sought a diagnostic label that captured the apparent premature cognitive decline.  
- Kraepelin’s descriptive system grouped these cases under “dementia praecox” to distinguish them from mood-related disorders (manic-depressive illness).  
- Because the prompt emphasizes that onset “often occurred before adulthood,” the historical label pointing to early dementia fits exactly.

3) Calculations or quantitative steps
- None required for this conceptual/historical question.

4) Why the correct answer is correct
- “Dementia praecox” directly names the phenomenon described: dementia-like decline appearing precociously (before adulthood). It was the dominant term in the late 1800s for what we now call schizophrenia.

5) Why the other options are incorrect
- Adolescent insanity: plausible-sounding but not the standard historical diagnostic term used by Kraepelin.  
- Catatonia previa: “catatonia” is a subtype/feature (Kahlbaum described it) but “catatonia previa” is not a historical label for schizophrenia as a whole.  
- Folie à deux: refers to shared psychotic disorder (two people sharing delusions), unrelated to the age-of-onset observation.

6) Conclusion
The historically used term that reflects early onset before adulthood is dementia praecox, which matches the provided correct answer.

In the 1800s physicians studying the disorder we now call schizophrenia used the term _________________ because they observed that the onset of symptoms often occurred before adulthood. 单项选择题

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