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Those more expressive of the traits linked with the serotonin system tend to observe social norms instead, as well as follow rules, respect authority, stick to plans and habits, and be good with numbers: the Meanwhile, those predominantly expressive of the traits linked with testosterone tend to be analytical, direct, decisive, tough-minded, and good at engineering, mechanics or other spatial/mathematical tasks: the Last, those particularly expressive of the estrogen system tend to see the big picture, as well as be imaginative, intuitive, good with people, linguistically skilled, empathetic and emotionally expressive: the .
But even though I meticulously studied the scientific literature to collect the suite of traits linked with each of these four biological systems, then carefully assembled these traits into a questionnaire, and have now collected questionnaire data on some 13 million members of and Chemistry.com, I needed to prove that my questionnaire actually measured these four biological systems. Lucy Brown and other colleagues, I gave my questionnaire to 17 newlyweds and 17 long-married people; then we put them in the brain scanner.
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