Mar 21, Both can explain why a child's IQ can be so different from his or her parents'. It is possible, for example, to inherit all the higher IQ genes from each parent and The only difference is they look at twins that were raised apart. A close attachment can prevent diseases, boost immunity, and enhance IQ in your Mother-child bonding has evolved to become a complex physiological . start of the amazing journey that is the relationship between a parent and a child: "A. Apr 17, The consequences, however, may extend to their children, report researchers who found that a mother's depression can negatively affect a.
The child had low birthweight.
Heritability of IQ - Wikipedia
Negative correlation The child is adopted. The child attended Head Start. The child is regularly spanked.
The child frequently watches television. In addition, ECLS data show no correlation between computer use and school test scores. The non correlated factors describe things that parents do. Most of the things that matter were decided long ago — who you are, whom you married, what kind of life you lead.
If you are smart, hardworking, well educated, well paid, and married to someone equally fortunate, then you children are likely to succeed. You may have known some intelligent and devoted parents who child went badly off the rails. From What makes a perfect parent? So genes do play a role in IQ.
One of my favorite examples to illustrate the effect of genes on intelligence is the Curie family. In our society, the Nobel Prize is considered evidence of great achievement. Marie and Pierre Curie were a scientist couple and Nobel Prize winners. Here is a perfect example of intelligent parents having intelligent children. The folks supporting the nature theory can argue this is due to genes.
Of course the other side can argue that Irene was raised in about the most stimulating environment possible. So they would argue that the environment explains Irene's success. As is usual in these kinds of arguments, both sides are right.
Genes and the environment each play a role. Scientists used twins to figure this out too. The only difference is they look at twins that were raised apart. The Environment is Important Too When identical twins are raised apart, they have the same genes but different environments after birth, anyway. Again, if IQ were purely genetic you'd expect where they were brought up not to matter.
As you can see by these results, it does matter: The easiest explanation is that genes are not everything…the environment is important too. Twins are the easiest to understand but it works with other family members too. In particular, it helps to compare related and unrelated children raised in the same house: Genes do matter as siblings are more likely to share the same IQ as compared to unrelated children being raised together.
The authors noted that previous research had produced inconsistent results on whether or not SES moderates the heritability of IQ.
They suggested three explanations for the inconsistency. First, some studies may have lacked statistical power to detect interactions.
Heritability of IQ
Second, the age range investigated has varied between studies. Third, the effect of SES may vary in different demographics and different countries. They argue that the shared maternal environment may explain the striking correlation between the IQs of twins, especially those of adult twins that were reared apart.
The Devlin et al. Pricein a comprehensive review published over 50 years ago, argued that almost all MZ twin prenatal effects produced differences rather than similarities. As of the literature on the topic was so large that the entire bibliography was not published. It was finally published in with an additional references. At that time Price reiterated his earlier conclusion Price, That is, those with a higher IQ tend to seek out stimulating environments that further increase IQ.
The direct effect can initially have been very small but feedback loops can create large differences in IQ. In their model an environmental stimulus can have a very large effect on IQ, even in adults, but this effect also decays over time unless the stimulus continues. This model could be adapted to include possible factors, like nutrition in early childhood, that may cause permanent effects.
The Flynn effect is the increase in average intelligence test scores by about 0. The authors suggest that programs aiming to increase IQ would be most likely to produce long-term IQ gains if they taught children how to replicate outside the program the kinds of cognitively demanding experiences that produce IQ gains while they are in the program and motivate them to persist in that replication long after they have left the program.
Some scientists have suggested that such enhancements are due to better nutrition, better parenting and schooling, as well as exclusion of the least intelligent, genetically inferior, people from reproduction. However, Flynn and a group of other scientists share the viewpoint that modern life implies solving many abstract problems which leads to a rise in their IQ scores.
Genome-wide association studies have demonstrated that the genes involved in intelligence remain fairly stable over time. Although the study deals with educational attainment and not IQ, these two are strongly linked. The authors concluded that most reported genetic associations with general intelligence are probably false positives brought about by inadequate sample sizes, but see. One method is to consider identical twins reared apart, with any similarities which exists between such twin pairs attributed to genotype.
In terms of correlation statistics, this means that theoretically the correlation of tests scores between monozygotic twins would be 1. Practically, however, the upper bound of these correlations are given by the reliability of the test, which is 0.
InBouchard and McGue reviewed such correlations reported in original studies in the United States. The mean correlation of IQ scores between monozygotic twins was 0. Kaufman and Elizabeth O. Lichtenberger reports correlations of 0.