We investigated a sample of one hundred twins as to their neurotic disturbances in childhood and adulthood. The hereditary factor was of greater effect with the continuing neuroses of childhood than with the weakening neuroses in childhood. But a certain effect of the hereditary factor could not be denied with neuroses manifesting themselves only in adulthood. According to our results the hereditary factor in childhood is not stronger than in adulthood, with adults it is as effective. Particular neurotic symptoms show influences of the hereditary factor in respect to depressive, maladaptive oral and maladaptive aggressive disturbances of behavior and difficulties in forming interpersonal relationships. In respect to stuttering, disturbances of the urogenital system and intelligence and occupational development a certain hereditary factor is very probable. Sex influences also have a certain effect: Behavioral disorders in childhood are found in the male sex, the female sex rather shows psychic symptoms.
Adolescent Adult