双胞胎中老大老二谁更聪明?

　　First-borns might score higher on measures of intelligence, because, at some point in their lives, they were only children who were the sole recipients of their parents' attention. Younger siblings might earn better grades, because they received mentoring from first-borns who already had to tackle certain subjects, the researchers say. Also, later born children might feel extra pressure to be competitive, and might try to out-do their older siblings in the hopes of gaining extra attention from parents.

　　研究人员称，先出生的孩子们之所以在智力测试上得分更高，是因为在生活的某一个阶段，他们是独生子女，故而能够独享父母的关爱。而晚出生的孩子之所以学习成绩更好，原因是他们能从哥哥姐姐那里得到课程辅导。而晚出生的孩子感受到的竞争压力更大，故而想表现得比哥哥姐姐更好，从而得到父母的更多关注。