Only €400 to get my brain size measured. Should I do it?
Why pay so much for so little?
>>17007185Socialism
>>17007182Brain size correlates at 0.27 with IQ. 71% of this is causal."Cox, S. R., Ritchie, S. J., Fawns-Ritchie, C., Tucker-Drob, E. M., & Deary, I. J. (2019). Structural brain imaging correlates of general intelligence in UK Biobank. Intelligence, 76, 101376.The associations between indices of brain structure and measured intelligence are unclear. This is partly because the evidence to-date comes from mostly small and heterogeneous studies. Here, we report brain structure-intelligence associations on a large sample from the UK Biobank study. The overall N=29,004, with N=18,426 participants providing both brain MRI and at least one cognitive test, and a complete four-test battery with MRI data available in a minimum N=7201, depending upon the MRI measure. Participants' age range was 44–81years (M=63.13, SD=7.48). A general factor of intelligence (g) was derived from four varied cognitive tests, accounting for one third of the variance in the cognitive test scores. The association between (age- and sex- corrected) total brain volume and a latent factor of general intelligence is r=0.276, 95% C.I.=[0.252, 0.300]."https://www.emilkirkegaard.com/p/brain-size-and-intelligence-2022?utm_source=publication-search"James Lee et al 2019 used siblings to estimate that 71% is causal"https://www.emilkirkegaard.com/p/modern-neuroscience-confirms-race?utm_source=publication-search
>>17007182You're better off taking an ancestry test for €90 and downloading your "raw" data. Then calculating a polygenic score. The uncorrected correlation between IQ polygenic score and IQ is 0.41.https://www.aporiamagazine.com/p/a-new-polygenic-score-for-intelligencehttps://github.com/KHP-Informatics/PRSice
>>17007185They need to use a Scanning Tunneling Microscope (STM) to find them.
>>17007182You are a frogposter it wont be big i think.
>>17007182you can do this yourselfall you need to do is make a home-made tomographic scanneryou can do this by disabling the lockout on your microwave door and sticking you head into ityou can use your cellphone as a receiver on the opposite side of your head to measure the transmission powerwiki how to do the reconstruction (there's probably a python library that makes it trivial, so don't worry if you aren't technically inclined)
>>17007206Oh please everyone already knows their iq. This is at least a physiological metric.
>>17007182why bother?if you're smart, you know itif you're not, you know itare you coping that you aren't smart by saying you might have a big brain, or do you know you are smart and are trying to find another way to wank about it?waste of money either way
>>17007422>Oh please everyone already knows their iq.IQ tests cost $1250, so this is >6x validity for the price.
>>17007206>The uncorrected correlation between IQ polygenic score and IQ is 0.41.wow thanks, now I know my IQ is somewhere between 50 and 165 (95% confidence)
>>17007585The 95% CI is ±12 points, not ±57.5, so for a mean of 107.5, that's 95.5 - 119.5. Obviously, if your mean is 135, that becomes 123 - 147. Either way, it's clear that you're probably above the mean
>>17007560Um they give them out for free at schools...some kids even get to try multiple times. I think mensa lets you do them themselves idk if they make you pay though.
>>17007182Does brain size even correlate with intelligence? Always thought it was surface area that mattered hence the wrinkles / smooth brain meme.>Should I do it?Nah, learn tensor calculus instead:)
>>17007185brvtal lol
>>17007614>for free at schoolsSo, you've already paid in some way (just that you never got to decide).Mensa pricing is from $60–$99.
>>17007560An online IQ test is free or nearly free.>b-b-but it's not a REAL testit sure as fuck has better correlation with professionally measured IQ scores than a fucking polygenic score if the 0.4 figure is accurate.
>>17007608You're confusing confidence for the mean with confidence for individual predictions.
>>17007754>your iq is 136, now please buy thislol
>>17007768Okay, when I said "free online IQ test" I didn't mean the first scam site that pops up when you google that.
>>17007185ultrakek
>>17007182just take an iq test and dont cheat lol
>>17007756>You're confusing confidence for the mean with confidence for individual predictions.The standard error of an observed score is just SQRT(1-r) * SD of observed score. The first part doesn't change for any given observed score (obviously).The only thing that changes is where the observed scores, true scores, and error scores are centered, which is how RTM happens. You are kind of right, as in error scores will be larger, so the value of the true score conditioned on the observed score will change for varying observed scores, but you can always use estimated true scores to fix this problem.So, 95% CI of the estimated true score of 106.225 is ± 11.043, so 95.182 to 117.268.The confidence-interval is using the error of the estimated true score, which is why it's smaller.
>>17007617Cortical gyrification is what you're talking about. This correlates positively with intelligence.https://gwern.net/doc/iq/2019-tadayon.pdfSurface area also matters."cortical surface is larger in more intelligent children at the age of 10. The cortical surface is still expanding, reaching its maximum area during adolescence. With higher IQ, cortical expansion is completed at a younger age; and once completed, surface area decreases at a higher rate. These findings suggest that intelligence may be more related to the magnitude and timing of changes in brain structure during development than to brain structure per se, and that the cortex is never completed but shows continuing intelligence-dependent development."https://assets-us-01.kc-usercontent.com/fdcfbfb4-ea5f-0080-b339-861bb5cb584d/35b3522c-9b79-45a8-9f66-97d40e9ace1f/2015_Schnack_CC.pdfThe reason that total brain volume correlates with intelligence is neurite density."High-IQ individuals are likely to possess more cortical volume than low-IQ individuals, which is indicated by differently sized brains(left side) and differently sized panels showing exemplary magnifications of neuron and neurite microstructure (right side). The difference in corticalvolume is highlighted by the shadow around the upper brain. The cerebral cortex of high-IQ individuals is characterizedby a low degree of neurite density and orientation dispersion, which is indicated by smaller and less ramified dendritic trees in the respective panel.Intellectual performance is likely to benefit from this kind of microstructural architecture since restricting synaptic connections to an efficient minimumfacilitates the differentiation of signals from noise while saving network and energy resources."https://www.nature.com/articles/s41467-018-04268-8.pdf
