>>10389423IQ varies across the life of the individual. Your brain grows until you're 10 years old, and then it matures until you're 25.
Drugs and not doing sports will age the brain faster, resulting in a drop in IQ. I believe that your intelligence is principally developed by 13 years old, and fully unlocked by 25 years old. It becomes measurable at 20-25 (in a meaningful ways), and remains measurable into old age.
You cannot increase your IQ, but you certainly can decrease it by hurting your head with concussions and drugs. Alzheimers has been described as "Type 3 Diabetes".
The brain does behave like a muscle in certain aspects, not practicing memory games will make you more forgetful in the short term. You cannot become smarter, but you can become faster at tasks (consider physics problems, if you've done 10 of them, you're slow and constantly need to look up formulae, if you've done 10000 of them, you'll know all the tricks by heart).
>>10389433"Practicing IQ tests" can improve your score by 1-3 points for the serious clinical ones. You're really just practicing test taking skills though. You will not become smarter.
>>10389457Correct about the genes, the frequency of taking IQ tests doesn't matter.
>>10389465Proof of this study?
Pic related is a study pioneering a method of predicting the phenotype from genetic information alone. The yellow line is their model, the blue line is the observed phenotypic average. Blue area is the confidence interval.
