ATTACHMENT BEHAVIOR IN THIRTEEN-MONTH-OLD, OPPOSITE SEX TWINS
نویسندگان
چکیده
منابع مشابه
Attachment behavior in thirteen-month-old, opposite-sex twins.
Seventeen sets of opposite sex twins, 13 to 14 months old, were observed in a playroom situation with their mothers. Attachment behaviors, toy preference, style of play, and activity level were recorded. Analysis of four attachment behaviors indicated that girls looked at, vocalized to, and maintained proximity with their mothers significantly more often than did their brothers. Girls also touc...
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The etiology of human same-sex romantic attraction is generally framed in terms of (1) social influences, (2) genetic influences, or (3) hormonal influences. In this article, we show that adolescent males who are opposite-sex twins are twice as likely as expected to report same-sex attraction; and that the pattern of concordance (similarity across pairs) of same-sex preference for sibling pairs...
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The question addressed in the present report is whether the large birth weight differences in dizygotic twin pairs of opposite sex (DZos), especially in 'male first' couples--observed by Blickstein and Weissman (Blickstein I, Weissman A. Birth weight discordancy in male-first and female-first pairs of unlike-sexed twins. Am J Obstet Gynecol 1990;162:661-663) and replicated in the present study-...
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BACKGROUND Increasing evidence shows that some cancers originate in utero. It is hypothesized that elevated exposure to some steroid hormones might increase cancer risk and that hormone transfer between twin fetuses could result in different prenatal exposure to testosterone. METHODS This large-scale prospective twin study compared opposite-sex (OS) and same-sex (SS) twins to test the impact ...
متن کاملSex difference in leukocyte telomere length is ablated in opposite-sex co-twins
BACKGROUND In eutherian mammals and in humans, the female fetus may be masculinized while sharing the intra-uterine environment with a male fetus. Telomere length (TL), as expressed in leukocytes, is heritable and is longer in women than in men. The main determinant of leukocyte TL (LTL) is LTL at birth. However, LTL is modified by age-dependent attrition. METHODS We studied LTL dynamics (LTL...
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ژورنال
عنوان ژورنال: ETS Research Bulletin Series
سال: 1973
ISSN: 0424-6144
DOI: 10.1002/j.2333-8504.1973.tb00462.x