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The scientists compared twins, who are 100% genetically alike, with each other and with their brothers, who share on average 50% of their genes. Twins used the same strategy more often than brothers did in the roughly 50 trials, suggesting that "there are qualitative differences in how individuals think, and these differences have a substantial genetic component,". Article @ Science

Paper: Koten et al [2009]. "Genetic Contribution to Variation in Cognitive Function: An fMRI Study in Twins". Science. 323 (5922): 1737 - 1740