The Nurture Assumption
Encyclopedia
The Nurture Assumption: Why Children Turn Out the Way They Do is a book written by Judith Rich Harris
Judith Rich Harris
Judith Rich Harris is a psychology researcher and the author of The Nurture Assumption, a book criticizing the belief that parents are the most important factor in child development, and presenting evidence which contradicts that belief.Harris has been a resident of Middletown Township, New...

, with a foreword
Foreword
A foreword is a piece of writing sometimes placed at the beginning of a book or other piece of literature. Written by someone other than the primary author of the work, it often tells of some interaction between the writer of the foreword and the book's primary author or the story the book tells...

 by Steven Pinker
Steven Pinker
Steven Arthur Pinker is a Canadian-American experimental psychologist, cognitive scientist, linguist and popular science author...

, originally published 1998 by the Free Press
Free Press (publisher)
Free Press is a book publishing imprint of Simon and Schuster. It was founded by Jeremiah Kaplan and Charles Liebman in 1947 and was devoted to sociology and religion titles. It was headquartered in Glencoe, Illinois, where it was known as The Free Press of Glencoe...

, which published a revised edition in 2009. It has been published in at least 20 languages. Its answer to "Why Children Turn Out the Way They Do" is that "Parents Matter Less Than You Think and Peers Matter More".

Summary

In this book, she challenges the idea that the personality
Personality psychology
Personality psychology is a branch of psychology that studies personality and individual differences. Its areas of focus include:* Constructing a coherent picture of the individual and his or her major psychological processes...

 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
Genetics
Genetics , a discipline of biology, is the science of genes, heredity, and variation in living organisms....

 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 all. 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' ... [as] a synonym for 'environment.'" 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
Birth order
Birth order is defined as a person's rank by age among his or her siblings. Birth order is often believed to have a profound and lasting effect on psychological development...

. 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
Peer group
A peer group is a social group consisting of humans. Peer groups are an informal primary group of people who share a similar or equal status and who are usually of roughly the same age, tended to travel around and interact within the social aggregate Members of a particular peer group often have...

 as an important shaper of the child's psyche. For example, children of immigrants learn the language
Language acquisition
Language acquisition is the process by which humans acquire the capacity to perceive, produce and use words to understand and communicate. This capacity involves the picking up of diverse capacities including syntax, phonetics, and an extensive vocabulary. This language might be vocal as with...

 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 don't 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
Interpersonal relationship
An interpersonal relationship is an association between two or more people that may range from fleeting to enduring. This association may be based on limerence, love, solidarity, regular business interactions, or some other type of social commitment. Interpersonal relationships are formed in the...

 between child and parent.

Critical reaction

The Nurture Assumption received mixed responses. Neuroscientist Robert Sapolsky
Robert Sapolsky
Robert Maurice Sapolsky is an American scientist and author. He is currently Professor of Biological Sciences, and Professor of Neurology and Neurological Sciences and, by courtesy, Neurosurgery, at Stanford University. In addition, he is a Research Associate at the National Museums of...

 of Stanford University
Stanford University
The Leland Stanford Junior University, commonly referred to as Stanford University or Stanford, is a private research university on an campus located near Palo Alto, California. It is situated in the northwestern Santa Clara Valley on the San Francisco Peninsula, approximately northwest of San...

 says her book is "based on solid science." Psychologist Steven Pinker
Steven Pinker
Steven Arthur Pinker is a Canadian-American experimental psychologist, cognitive scientist, linguist and popular science author...

 of Harvard predicts that the book "will come to be seen as a turning point in the history of psychology
History of psychology
The history of psychology as a scholarly study of the mind and behavior dates back to the Ancient Greeks. There is also evidence of psychological thought in ancient Egypt. Psychology was a branch of philosophy until the 1870s, when psychology developed as an independent scientific discipline in...

."

However, Frank Farley of Temple University
Temple University
Temple University is a comprehensive public research university in Philadelphia, Pennsylvania, United States. Originally founded in 1884 by Dr. Russell Conwell, Temple University is among the nation's largest providers of professional education and prepares the largest body of professional...

 claims that "she's taking an extreme position based on a limited set of data. Her thesis is absurd on its face, but consider what might happen if parents believe this stuff!" Wendy Williams of Cornell University
Cornell University
Cornell University is an Ivy League university located in Ithaca, New York, United States. It is a private land-grant university, receiving annual funding from the State of New York for certain educational missions...

, who studies how environment affects IQ, argues that "there are many, many good studies that show parents can affect how children turn out in both cognitive abilities and behavior." Jerome Kagan
Jerome Kagan
Jerome Kagan was born in 1929, and grew up in Rahway, New Jersey, USA. Kagan is currently retired after being a professor at Harvard University in the Developmental program . He is one of the key pioneers of developmental psychology. He is Daniel and Amy Starch Research Professor of Psychology,...

 of Harvard University
Harvard University
Harvard University is a private Ivy League university located in Cambridge, Massachusetts, United States, established in 1636 by the Massachusetts legislature. Harvard is the oldest institution of higher learning in the United States and the first corporation chartered in the country...

 argues that Harris "ignores some important facts, ones that are inconsistent with this book's conclusions.

Harris rejects the idea that her book will encourage parents to neglect or mistreat their children. She maintains that parents will continue to treat their children well "for the same reason you are nice to your friends and your partner, even though you have no hopes of molding their character. For the same reason your great-grandparents were nice to their children, even though they didn't believe in the nurture assumption".

Reviews

  • "Do Parents Matter?", Malcolm Gladwell
    Malcolm Gladwell
    Malcolm Gladwell, CM is a Canadian journalist, bestselling author, and speaker. He is currently based in New York City and has been a staff writer for The New Yorker since 1996...

    , The New Yorker
    The New Yorker
    The New Yorker is an American magazine of reportage, commentary, criticism, essays, fiction, satire, cartoons and poetry published by Condé Nast...

    , August 17, 1998.
  • Psychpage review, Richard Niolon.
  • "The Nature of Nurture", Steve Sailer
    Steve Sailer
    Steven Ernest Sailer is an American journalist and movie critic for The American Conservative, a blogger, a VDARE.com columnist, and a former correspondent for UPI. He writes about race relations, gender issues, politics, immigration, IQ, genetics, movies, and sports.-Personal life:Sailer grew up...

    .
  • "Peer Pressure", Carol Tavris
    Carol Tavris
    Carol Anne Tavris is an American social psychologist and author. She received a Ph.D. in social psychology from the University of Michigan, and has taught psychology at the University of California, Los Angeles and the New School for Social Research...

    , New York Times, September 13, 1998.
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