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''The Nurture Assumption: Why Children Turn Out the Way They Do'' is a book by Judith Rich Harris, with a foreword by Steven Pinker, originally published 1998 by the Free Press, which published a revised edition in 2009. It has been published in at least 20 languages. The book was a 1999 Pulitzer Prize finalist (general non-fiction). Its answer to "Why Children Turn Out the Way They Do" is that "Parents Matter Less Than You Think and Peers Matter More". ==Summary== Harris challenges the idea that the personality of adults is determined chiefly by the way they were raised by their parents. She looks at studies which claim to show the influence of the parental environment and claims that most fail to control for genetic influences. For example, if aggressive parents are more likely to have aggressive children, this is not necessarily evidence of parental example. It may also be that aggressiveness has been passed down through the genes. Indeed, many adopted children show little correlation with the personality of their adoptive parents, and significant correlation with the natural parents who had no part in their upbringing. The role of genetics in personality has long been accepted in psychological research. However, even identical twins, who share the same genes, are not exactly alike, so inheritance is not the only determinant of personality. Psychologists have tended to assume that the non-genetic factor is the parental environment, the "nurture". However, Harris argues that it is a mistake to use "'nurture' ... () a synonym for 'environment.'"〔(The Nurture Assumption, Chapter 1 )〕 Many twin studies have failed to find a strong connection between the home environment and personality. Identical twins differ to much the same extent whether they are raised together or apart. Adoptive siblings are as unalike in personality as non-related children. Harris also argues against the effects of birth order. She states: Birth order effects are like those things that you think you see out of the corner of your eye but that disappear when you look at them closely. They do keep turning up but only because people keep looking for them and keep analyzing and reanalyzing their data until they find them. Harris' most innovative idea was to look outside the family and to point at the peer group as an important shaper of the child's psyche. For example, children of immigrants learn the language of their home country with ease and speak with the accent of their peers rather than their parents. Children identify with their classmates and playmates rather than their parents, modify their behavior to fit with the peer group, and this ultimately helps to form the character of the individual. Contrary to some reports, Harris did not claim that "parents do not matter". The book did not cover cases of serious abuse and neglect. Harris pointed out that parents have a role in selecting their children's peer group, especially in the early years. Parents also affect the child's behavior within the home environment and the interpersonal relationship between child and parent. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「The Nurture Assumption」の詳細全文を読む スポンサード リンク
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