Dementia praecox is not
dissociative identity disorder or multiple personality disorder. It's an outdated term meaning 'precocious madness'.
Now they think it may have been a rapidly degenerating type of mood disorder, but that's not the point.
Why didn't Mendoza check this information, so easily found on google? In what I thought was an otherwise intelligent and good film, this stuck out like a sore thumb.
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"It's better not to know so much about what things mean." David Lynch