Difference between revisions of "Dysgenic fertility"
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The '''dysgenic fertility''' theory posits an inverse relationship between intelligence and fertility (Lower intelligence people having more children). | The '''dysgenic fertility''' theory posits an inverse relationship between intelligence and fertility (Lower intelligence people having more children). | ||
| − | As far as dysgenic fertility (people with lower intelligence having more children) and its effect on population's intelligence, the abstract for journal article ''IQ and fertility: A cross-national study'' published in the journal ''Intelligence'' states: "Many studies have found a small to moderate negative correlation between IQ and fertility rates. However, these studies have been limited to the United States and some European countries. The present study was a between-nation study using national IQ scores and national fertility rates. There were strong negative correlations found between national IQ and three national indicators of fertility."<ref>Abstract for journal article ''Intelligence'', [https://www.sciencedirect.com/science/article/abs/pii/S0160289607000244#:~:text=Numerous%20studies%20have%20confirmed%20that,with%20higher%20levels%20of%20IQ. IQ and fertility: A cross-national study] by Steven M. Shatz, Volume 36, Issue 2, March–April 2008, Pages 109-111</ref> | + | As far as [[dysgenic]] fertility (people with lower intelligence having more children) and its effect on population's intelligence, the abstract for journal article ''IQ and fertility: A cross-national study'' published in the journal ''Intelligence'' states: "Many studies have found a small to moderate negative correlation between [[IQ]] and fertility rates. However, these studies have been limited to the United States and some European countries. The present study was a between-nation study using national IQ scores and national fertility rates. There were strong negative correlations found between national IQ and three national indicators of fertility."<ref>Abstract for journal article ''Intelligence'', [https://www.sciencedirect.com/science/article/abs/pii/S0160289607000244#:~:text=Numerous%20studies%20have%20confirmed%20that,with%20higher%20levels%20of%20IQ. IQ and fertility: A cross-national study] by Steven M. Shatz, Volume 36, Issue 2, March–April 2008, Pages 109-111</ref> |
The abstract for the journal article ''Do high-status people really have fewer children? : Education, income, and fertility in the contemporary U.S'' published in the journal ''Human Nature'' states: | The abstract for the journal article ''Do high-status people really have fewer children? : Education, income, and fertility in the contemporary U.S'' published in the journal ''Human Nature'' states: | ||
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An excerpt for abstract for the journal article ''The decline of the world's IQ'' published in the journal Intelligence by Richard Flynn and John Harvey states: | An excerpt for abstract for the journal article ''The decline of the world's IQ'' published in the journal Intelligence by Richard Flynn and John Harvey states: | ||
| − | {{Cquote|Dysgenic fertility means that there is a negative correlation between intelligence and number of children. Its presence during the last century has been demonstrated in several countries. We show here that there is dysgenic fertility in the world population quantified by a correlation of −0.73 between IQ and fertility across nations. It is estimated that the effect of this has been a decline in the world's genotypic IQ of 0.86 IQ points for the years 1950–2000. A further decline of 1.28 IQ points in the world's genotypic IQ is projected for the years 2000–2050. In the period 1950–2000 this decline has been compensated for by a rise in phenotypic intelligence known as the Flynn Effect, but recent studies in four economically developed countries have found that this has now ceased or gone into reverse. It seems probable that this “negative Flynn Effect” will spread to economically developing countries and the whole world will move into a period of declining genotypic and phenotypic intelligence.<ref>[http://www.iapsych.com/iqmr/fe/LinkedDocuments/lynn2008.pdf The decline of the world's IQ] by Richard Flynn and John Harvey, Intelligence 36 (2008) 112–120</ref>}} | + | {{Cquote|Dysgenic fertility means that there is a negative correlation between intelligence and number of children. Its presence during the last century has been demonstrated in several countries. We show here that there is dysgenic fertility in the world population quantified by a correlation of −0.73 between IQ and fertility across nations. It is estimated that the effect of this has been a decline in the world's genotypic IQ of 0.86 IQ points for the years 1950–2000. A further decline of 1.28 IQ points in the world's genotypic IQ is projected for the years 2000–2050. In the period 1950–2000 this decline has been compensated for by a rise in [[Phenotype|phenotypic]] intelligence known as the [[Flynn Effect]], but recent studies in four economically developed countries have found that this has now ceased or gone into reverse. It seems probable that this “negative Flynn Effect” will spread to economically developing countries and the whole world will move into a period of declining genotypic and phenotypic intelligence.<ref>[http://www.iapsych.com/iqmr/fe/LinkedDocuments/lynn2008.pdf The decline of the world's IQ] by Richard Flynn and John Harvey, Intelligence 36 (2008) 112–120</ref>}} |
== Notes == | == Notes == | ||
{{reflist|2}} | {{reflist|2}} | ||
[[Category: Sociology]] | [[Category: Sociology]] | ||
Revision as of 10:56, December 26, 2021
The dysgenic fertility theory posits an inverse relationship between intelligence and fertility (Lower intelligence people having more children).
As far as dysgenic fertility (people with lower intelligence having more children) and its effect on population's intelligence, the abstract for journal article IQ and fertility: A cross-national study published in the journal Intelligence states: "Many studies have found a small to moderate negative correlation between IQ and fertility rates. However, these studies have been limited to the United States and some European countries. The present study was a between-nation study using national IQ scores and national fertility rates. There were strong negative correlations found between national IQ and three national indicators of fertility."[1]
The abstract for the journal article Do high-status people really have fewer children? : Education, income, and fertility in the contemporary U.S published in the journal Human Nature states:
| “ | We find that increased education is strongly associated with delayed childbearing in both sexes and is also moderately associated with decreased completed or near-completed fertility. Women in the general population with higher adult income have fewer children, but this relationship does not hold within all educational groups, including our sample with elite educations. Higher-income men, however, do not have fewer children in the general population and in fact have lower childlessness rates. Further, higher income in men is positively associated with fertility among our sample with elite educations as well as within the general population among those with college educations. Such findings undermine simple statements on the relationship between status and fertility.[2] | ” |
The journal Intelligence published a journal article entitled IQ and fertility: A cross-national study and its abstract states: "Many studies have found a small to moderate negative correlation between IQ and fertility rates. However, these studies have been limited to the United States and some European countries. The present study was a between-nation study using national IQ scores and national fertility rates. There were strong negative correlations found between national IQ and three national indicators of fertility."[3]
An excerpt for abstract for the journal article The decline of the world's IQ published in the journal Intelligence by Richard Flynn and John Harvey states:
| “ | Dysgenic fertility means that there is a negative correlation between intelligence and number of children. Its presence during the last century has been demonstrated in several countries. We show here that there is dysgenic fertility in the world population quantified by a correlation of −0.73 between IQ and fertility across nations. It is estimated that the effect of this has been a decline in the world's genotypic IQ of 0.86 IQ points for the years 1950–2000. A further decline of 1.28 IQ points in the world's genotypic IQ is projected for the years 2000–2050. In the period 1950–2000 this decline has been compensated for by a rise in phenotypic intelligence known as the Flynn Effect, but recent studies in four economically developed countries have found that this has now ceased or gone into reverse. It seems probable that this “negative Flynn Effect” will spread to economically developing countries and the whole world will move into a period of declining genotypic and phenotypic intelligence.[4] | ” |
Notes
- ↑ Abstract for journal article Intelligence, IQ and fertility: A cross-national study by Steven M. Shatz, Volume 36, Issue 2, March–April 2008, Pages 109-111
- ↑ Human Nature, Do high-status people really have fewer children? : Education, income, and fertility in the contemporary U.S, 2006 Dec;17(4):377-92. doi: 10.1007/s12110-006-1001-3.
- ↑ IQ and fertility: A cross-national study by Steven M.Shatz, Intelligence, Volume 36, Issue 2, March–April 2008, Pages 109-111
- ↑ The decline of the world's IQ by Richard Flynn and John Harvey, Intelligence 36 (2008) 112–120