The study specifically controlled to find causationhttps://twitter.com/brobrahbrehbro/status/1142592617391120384 …
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Nope. Longitudinal studies can't reveal causation unless they do random assignment or include twin/family design that can control for genetic confounds.
The study followed individuals for over 20 years, testing their IQ at 13, and then in their 30s
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Kids with genes that cause them to have slower growth in intelligence between 13 and 30 might be more predisposed to take drugs. Causation has not been proved.
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IQ is remarkably stable throughout your life, even from childhood – please try and get up to speed before muddying the waters any further
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IQ is quite stable, but heritability increases until early 20s, and developmental behavior genetics shows new genetic influences affect IQ in adolescence & young adulthood.
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When people say heritability increases, it confuses me. Does that mean the expression of IQ changes and trends towards the heritable mean of the parents, despite being higher or lower earlier? It sounds like you get new genetic material or new genes come online, otherwise.
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I think it's because genes come online, and people have more control over their environment as they get older so the environment you were born into has less impact and the environment your genes "want" has more.
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Thank you. Check for understanding: a heritable preference in experience(s) creates a feedback loop that becomes stronger as we have more autonomy?
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Also, if this is the correct meaning, can you square that with the second half of what Geoffrey said, re: new genetic influences in adolescence? Just more environment preference?
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The new genetic influences can be both, genes coming online, and your genes having more agency over you as you get older and can more pick your environment.
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Yes. But longitudinal studies by themselves cannot show causation. Bad study design + low power + no genetic controls + no randomization = no scientific value.
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I wonder what the average IQ is of your regular donors...
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You still haven't understood what he is telling you. The structure of the study will not be able to give you causation, regardless of their controls. But but tHeY SpEcIfIcAlly cOnTrOlled tO FiNd cAuSaTiOn
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Study doesn't prove anything, can't be taken seriously. End of a story. Tho taking any non performance increasing drug is harmful in the long term.
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