THE MINNESOTA TWIN REGISTRY

我们建议找到大约9,500对中的80%， 1936年至1955年在明尼苏达州出生的同性双胞胎。 这对双胞胎将 被要求提供传记（包括医疗）以及 个性和兴趣测试数据，使用三个连续水平的 增加激励。 第一个目标是建立一个大型双胞胎 家庭登记处，可能是有用的，我们自己和他人的未来 精神病学和生物医学研究。 第二个目标是测试 容易招募的双卵双胞胎更相似的假设 在许多维度上，DZ双胞胎比DZ双胞胎更不容易招募 因此，已发表的DZ相关性高估了真实的相似性， DZ双胞胎一般 同样的数据将从配偶和第一个 参与双胞胎的直系亲属。 第三个目标是 复制和扩展以前的发现“涌现”性状，其中MZ 相关性高，而DZ（和其他一级）相关性低 或零。 第四个目标是进行大规模的生物统计分析 双胞胎家庭的数据 第五个目标是提供一个基础， 选择100 MZ和100 DZ对的真正代表性样本，其中 每对双胞胎都有一个配偶和至少一个成年后代， 来我们的大学实验室进行为期2天的能力测试， 心理生理测试

We propose to locate some 80 percent of the approximately 9,500 pairs of same-sex twins born in Minnesota from 1936 through 1955. These twins will be solicited to provide biographical (including medical) as well as personality and interest test data, using three successive levels of increased incentive. The first objective is to establish a large twin family registry that could be useful to ourselves and others in future psychiatric and biomedical research. The second objective is to test the hypothesis that easily recruited dizygotic twins are more similar within-pairs on many dimensions than are less easily recruited DZ twins and, hence, that published DZ correlations overestimate the true similarity of DZ twins generally. The same data will be obtained from spouses and 1st degree relatives of participating twins. The third objective is to replicate and extend previous findings of "emergenic" traits in which MZ correlations are high while DZ (and other 1st degree) correlations are low or zero. A fourth objective is to perform large-scale biometrical analyses on these twin-family data. A fifth objective is to provide a basis for selecting a truly representative sample of 100 MZ and 100 DZ pairs in which each twin has a spouse and at least one young-adult offspring available to come to our University laboratories for 2 days of aptitude and psychophysiological testing.