13 votes
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What is the meaningful difference between someone with a 145 IQ compared to a 100 IQ?

As a general note, precision in measurement of intelligence declines as you move to more extreme levels. There is greater uncertainty in measurement in the 145 range than there is at the 100 range. ...
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12 votes
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Is Fluid Intelligence Dropoff With Age an Established Fact?

You are asking two very excellent questions. Is the decline in fluid intelligence commonly accepted as true? These days it seems generally accepted, that the trend is true. However, this hasn´t been ...
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  • 443
10 votes
Accepted

Have different mental strengths evolved in men and women?

There is little neurological evidence that finds a difference between men and women. However there are psychological studies that do find a small difference in mental strengths. This interesting TED ...
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  • 216
10 votes
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What are the IQ correlations between relatives?

Recent studies on this topic deal with more detailed questions, that are analysed using structural equation models (Deary et al., 2006). A main goal has been the identification of specific genes. No ...
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10 votes

Is there any evidence that fluid intelligence is malleable?

Is there any evidence of malleability of fluid intelligence? In the downward direction, definitely yes. There are many ways you can directly pull fluid intelligence downwards. Things like being ...
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  • 700
9 votes

How valid is Lumosity's Brain Performance Index and what normative information is available?

Because it has been a few years since Jeromy's original answer, and because I just read a very apt article, I will venture an update on the state of the field with respect to the BPI's validity. ...
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9 votes

Why might a person get widely varying scores on different online IQ tests?

Firmin et al. (2008) tested the validity of a handful of online IQ tests by having college students complete IQ tests at three different websites and also complete a validated lab measure, the ...
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8 votes

Is there a relationship between schizophrenia and genius?

The question you have asked is not a new one. In fact, from the times of classical antiquity, Plato considered artistic creativity as a result of god-given madness. When it comes to popular figures in ...
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  • 1,154
8 votes

Gender differences in IQ among undergraduate psychology students

I think what happens is that researchers often don't report on - or at least don't highlight - uninteresting results, partly because of the difficulty getting uninteresting results published. So ...
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8 votes

How do cognitive scientists measure creativity?

The Torrance Test of Creative Thinking is a good place to start. It scores for fluency (number of responses) as well as originality (statistical rarity of responses) and elaboration (level of detail) ...
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  • 2,903
8 votes

Does practicing Ravens Progressive Matrices tests inflate your IQ score?

Yes, practice even as simple retest improves scores in matrices-like tests: Raven’s APM scores increase significantly on repeated testing without any targeted training (e.g., Bors & Vigneau, ...
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  • 9,905
7 votes

How to calculate IQ from bhatia battery test?

I hadn't heard of the Bhatia measure before. A little research (see page 42 of Sharma and Sharma) explains that it is a performance based measure of ability for children in India. In general, you ...
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7 votes

What factors affect the g factor?

So you're basically asking what are the causes of interpersonal differences in intelligence as typically measured by standardised psychometric tests. This question forms the basis for a large ...
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7 votes

Is there an accurate online IQ test for measuring 160+ IQs?

To add to the existing answers (of which @what's gets special mention), an issue I don't think has really been addressed is the statistical reason for it being so difficult to measure extremely high ...
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  • 1,472
7 votes

How is intelligence correlated to beauty?

The correlation between physical attractiveness and IQ is somewhere between insignificant and mildly positive, with a slightly higher correlation for men. The correlation between physical ...
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7 votes

Is there a relationship between body composition and intelligence?

A systematic meta-analysis of the relationship between IQ and obesity (Yu, Han, Cao and Guo, 2010) suggested that lower IQ in childhood was associated with later adult obesity via educational level. ...
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7 votes
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Does high IQ give cause to doubt an ADHD diagnosis?

Sounds to me like someone is making a logical fallacy here, though the origin of this fallacy isn't clear to me. We cannot go from 'poor academic performance', to 'not amounting to anything', to '...
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7 votes

What is the meaningful difference between someone with a 145 IQ compared to a 100 IQ?

Consider, a normal IQ score falls between the range 85-115 which is approximately 70% of the population (and only 15% of people have an IQ of 115 or above), while an extended average IQ range tends to ...
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7 votes

What is the rationale for the normal distribution of intelligence?

Short answer IQ scores are distributed normally, because they follow the central limit theorem. Background When we measure IQ scores in sufficiently large populations, they will be normally ...
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  • 19.6k
7 votes
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How is the g-factor of intelligence calculated?

PCA or EFA: A standard approach to calculating a g factor would be to use principal components analysis (PCA) or exploratory factor analysis (EFA). Basically, you administer a broad battery of ...
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7 votes

Is there a theoretical maximum for IQ?

There are a few ways that you could answer this question. First, IQ is defined with a mean of 100 and a standard deviation of 15. But this is a normative score and relative to a given target ...
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6 votes

Gender differences in IQ among undergraduate psychology students

One meta-analysis of gender differences in cognitive abilities (verbal ability, quantitative ability, and visual–spatial ability): Results indicate that gender differences in all of these abilities ...
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  • 2,396
6 votes
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Does social interaction increase intelligence?

NB: my apologies, not enough rep points to post additional links. this is far too nebulous a statement, and if it were true, would most likely be based on non-experimental data. one example that ...
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  • 1,237
6 votes

Does motivation and interest correlate highly with IQ and can someone be smart but perform poorly in a particular field?

Intelligence refers to a general cognitive capacity, it does not refer to knowledge in specific fields of study. This means that yes, it is possible to have high intelligence but have low knowledge / ...
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6 votes
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Why Bayesian Cognitive Modeling?

Here's a quick answer from general background knowledge, not from any specific knowledge of "Bayesian Program Synthesis (BPS)" In general, Bayesian models can use strongly informed priors or diffuse "...
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