When did Leo Kanner move to the U.S.?
Leo Kanner
{'answer_start': array([-1]), 'answer_text': array([''], dtype=object)}
Kanner's first research publication, "General Paralysis Among The North American Indians," explored the rarity of general paralytic dementia, a neuropsychiatric disorder that occurs in late-stage syphilis, in the Native Americans he treated at the Yankton State Hospital. In his premier paper, Kanner stated that in what he considered the more "civilized" countries of Europe, there was a higher susceptibility to paralytic dementia from syphilis compared to the "less civilized" Native Americans. Although syphilis was very common amongst the Native Americans, Kanner only came across one patient, Thomas T. Robertson, who was Native American and had symptoms of the late-stage syphilis dementia. Kanner concluded that Native Americans rarely got general paralytic dementia because syphilis had been in their population for so long that it lost the power to produce general paralysis. On the other hand, Kanner argued, syphilis was relatively new to the white populations of Europe so it was more likely to produce general paralysis. However, Kanner believed that with time, the white race could also gain a similar resistance to general paralysis like that of the Native Americans.[17]