IQ genetics or environment? Both come into play

IQ genetics or environment? Let’s provide a bit of background to the question. Many studies have been published which have investigated the issue and it is undeniable that there is a positive correlation between the IQ of offspring with that of their birth parents, especially the birth mother. A particularly intereting series of studies involved …
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IQ differences between siblings

Researchers at the University of Illinois have published the results of the largest-ever “within family” evaluation of IQ and personality difference among siblings. The study helps shed light on IQ differences between siblings. This very large sample study (backed by the National Institute on Aging which is part of the National Institute of Health) looked at …
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IQ and age (part II)

In my last posting here, I provided a brief overview about IQ and age. The brain develops quickly in childhood and in early adolescence. It has been argued that the brain reaches its full cognitive ability potential by the age of 16. This is illustrated by the fact that high IQ societies such as Mensa …
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IQ booster pills on the way?

Many researchers are now involved in the evaluation of ways to halt the effects of ageing. In terms of IQ and cognitive ability, I have written extensively on how General Intelligence (or G) can be decomposed into two broad types of intelligence: (1) fluid intelligence (Gf), which is akin to raw processing power of the brain …
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Free IQ test

There are a very large number of IQ testing resources online.  Unfortunately, very few of the online IQ tests are any good. The issue with the vast majority of online IQ tests is that they tend to over estimate test takers’ IQ. So test takers will end up thinking that they are smarter than they …
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IQ standard deviation

Intellectual Quotient (IQ) is defined by the Oxford English Dictionary as: a number representing a person’s reasoning ability (measured using problem-solving tests) as compared to the statistical norm or average for their age, taken as 100. This definition is simplistic in the sense that it ignores that origins of the IQ test. In the late 1890s, …
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Highest IQ – the measurement challenges

This articles highlights some of the challenges associated with measuring human intelligence and in particular those associated with the measurement of the highest IQ. First, unlike measuring height, weight and even human speed on a 100 meter dash, measuring IQ (and particularly the highest IQ) is a difficult endeavor. Alfred Binet – one of the …
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New IQ test questions

Happy 2014 everyone! Wishing everyone health and happiness for the year to come. Body and mind. At iq-brain.com, we aim to provide the most reliable culture-fair testing on the web. IQ can be decomposed into two principal components of fluid (Gf) and crystallized (Gc) IQ. As explained previously, fluid intelligence relates to your ability to …
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Alcohol consumption and IQ

A study published in 2010 has suggested that brighter children in the UK and the US grow up to drink more alcohol. There is a very strong monotonic association between childhood intelligence (measured before the age of 16) and the frequency of alcohol consumption in their 20s, 30s and 40s. Very bright British children (with …
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