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It is well known that we get better at the things we practice, but is it possible to stimulate the brain with activites in such a way that general or spesific intelligence is weakened? Also, are there skills that can be practiced that has been proven to weaken other skills?

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    $\begingroup$ Interesting question: I don't know of any work in this area. Usually the question would be framed negatively: i.e., being in-curious will lessen the development of intelligence. Not aware of studies on "Doing x lowers IQ" (except where x is damaging to the brain). $\endgroup$ – tim Jun 29 '15 at 8:18
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    $\begingroup$ Well yes, but only over a long term and most likely during development period. Brain is like super-security system which is very hard to break. If you feed it with nonsense, it will actually use it to find new connections from what is already understands. $\endgroup$ – Andrewski Jul 1 '15 at 15:20
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    $\begingroup$ I don't know if it would be considered a "mental activity", but this is worth reading: Popular electric brain stimulation method used to boost brainpower is detrimental to IQ scores. $\endgroup$ – Josh Jun 22 '17 at 20:27

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