The Monster Study was a stuttering experiment performed on 22 orphan children in Davenport, Iowa in 1939. It was conducted by Wendell Johnson at the University of Iowa. Graduate student Mary Tudor conducted the experiment under Johnson's supervision. Half of the children received positive speech therapy, praising the fluency of their speech, and the other half, negative speech therapy, belittling the children for speech imperfections. Many of the normal speaking orphan children who received negative therapy in the experiment suffered negative psychological effects, and some retained speech problems for the rest of their lives.
纳粹的优生计划是被美国的优生计划启发的,阿道夫·希特勒在1925年的《我的奋斗》中赞扬并纳入了优生思想,效仿了美国首创的对缺陷者进行绝育的优生立法。
二战后的几十年里,随着对人权的更加重视,许多国家开始放弃优生政策,尽管一些西方国家(其中美国、加拿大、瑞典)继续实行强制绝育。
https://en.wikipedia.org/wiki/Eugenics
https://en.wikipedia.org/wiki/Eugenics_Board_of_North_Carolina
https://en.wikipedia.org/wiki/Eugenics_in_California