The phrase nature and nurture relates to the relative importance of an individual's innate qualities ("nature" in the sense of nativism or innatism) as compared to an individual's personal experiences ("nurture" in the sense of empiricism or behaviorism) in causing individual differences, especially in behavioral traits. The alliterative expression "nature and nurture" in English has been in use since at least the Elizabethan period and goes back to medieval French.The combination of the two concepts as complementary is ancient (Greek: ἁπό φύσεως καὶ εὐτροφίας). The phrase in its modern sense was popularized by the English Victorian polymath Francis Galton, the modern founder of eugenics and behavioral genetics, discussing the influence of heredity and environment on social advancement. Galton was influenced by the book On the Origin of Species written by his half-cousin, Charles Darwin. The view that humans acquire all or almost all their behavioral traits from "nurture" was termed tabula rasa ("blank slate") by John Locke in 1690. A "blank slate view" in human developmental psychology assuming that human behavioral traits develop almost exclusively from environmental influences, was widely held during much of the 20th century (sometimes termed "blank-slatism").The debate between "blank-slate" denial of the influence of heritability, and the view admitting both environmental and heritable traits, has often been cast in terms of nature versus nurture. These two conflicting approaches to human development were at the core of an ideological dispute over research agendas throughout the second half of the 20th century. As both "nature" and "nurture" factors were found to contribute substantially, often in an extricable manner, such views were seen as naive or outdated by most scholars of human development by the 2000s. In their 2014 survey of scientists, many respondents wrote that the dichotomy of nature versus nurture had outlived its usefulness, and should be retired. The reason is that in many fields of research, close feedback loops have been found in which "nature" and "nurture" influence one another constantly, as seen in self-domestication. As in ecology and behavioral epigenetics, researchers think nurture has an essential influence on nature. Similarly in other fields, the dividing line between an inherited and an acquired trait becomes unclear, as in epigenetics or fetal development.

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