[Genetic analysis of human behavior: epistemological methods and limits]

The genetics of human behavior, whether dealing with socio-biology, or with the heritability of schizophrenia or of IQ levels, is currently a controversial domain. The author briefly presents the relatively new methods of genetic pedigree examination utilizing likelihood calculation analyses, and compares this method to the more classical evaluations by family, twin, and adopted children studies. Illustrative examples are drawn from work on the genetics of schizophrenia.