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- W4280594908 abstract "Brain size and IQ are positively correlated. However, multiple meta-analyses have led to considerable differences in summary effect estimations, thus failing to provide a plausible effect estimate. Here we aim at resolving this issue by providing the largest meta-analysis and systematic review so far of the brain volume and IQ association (86 studies; 454 effect sizes from k = 194 independent samples; N = 26 000+) in three cognitive ability domains (full-scale, verbal, performance IQ). By means of competing meta-analytical approaches as well as combinatorial and specification curve analyses, we show that most reasonable estimates for the brain size and IQ link yield r-values in the mid-0.20s, with the most extreme specifications yielding rs of 0.10 and 0.37. Summary effects appeared to be somewhat inflated due to selective reporting, and cross-temporally decreasing effect sizes indicated a confounding decline effect, with three quarters of the summary effect estimations according to any reasonable specification not exceeding r = 0.26, thus contrasting effect sizes were observed in some prior related, but individual, meta-analytical specifications. Brain size and IQ associations yielded r = 0.24, with the strongest effects observed for more g-loaded tests and in healthy samples that generalize across participant sex and age bands." @default.
- W4280594908 created "2022-05-22" @default.
- W4280594908 creator A5028562564 @default.
- W4280594908 creator A5032384324 @default.
- W4280594908 creator A5039047858 @default.
- W4280594908 creator A5067241801 @default.
- W4280594908 date "2022-05-01" @default.
- W4280594908 modified "2023-10-14" @default.
- W4280594908 title "Of differing methods, disputed estimates and discordant interpretations: the meta-analytical multiverse of brain volume and IQ associations" @default.
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