The former are labouring under dementia, not amentia.
"Chapters in the History of the Insane in the British Isles"
Daniel Hack Tuke
Cretinism is a form of amentia, which is endemic in certain districts, especially in some of the valleys of Switzerland, Savoy, and France.
"Aids to Forensic Medicine and Toxicology"
W. G. Aitchison Robertson