[The genesis of informed consent in the context of medical research ethics 1900-1931].

At the turn of the 20th century, the problem of human experimentation and the need to obtain consent became more important among medical practitioners and the general public. The case of the venereologist Albert Neisser, among others, is used to trace the development of research ethics standards in Germany between the end of the 19th century and 1931. The concept of informed consent, which originated in research ethics, is also of central importance in clinical ethics today.