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I read an article that fluid intelligence can be trained, not simply just by doing problems that involves fluid intelligence:

are there any online programs and websites that are especially good for this? Any recommendations?

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Fluid intelligence is tied to biology. It is defined as our "on-the-spot reasoning ability, a skill not basically dependant on our experience."

Brain Workshop - a Dual N-Back game

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Brain Workshop is a free open-source version of the dual n-back brain training exercise. A recent study published in PNAS, an important scientific journal, shows that a memory task called dual n-back improves working memory (short term memory) and fluid intelligence. These findings are important because fluid intelligence was previously thought to be unchangeable.

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Similar Minds

enter image description here is a resource for personality tests and personality psychology. All the tests at are developed based on scientific measures used to ensure test validity. You can test yourself in Visual Pattern Fluid Intelligence Test

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Welcome to This test is developed with the aim of measuring your Intelligence Quotient (IQ)

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I'm pretty sceptical of any training that aims to increase your fluid intelligence. Practicing intelligence test items may improve your score on intelligence test items, but I doubt it would generalise to other domains.

I think you're better off trying to acquire domain specific expertise in whatever domain interests you than trying to change something as general as fluid intelligence.

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