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Titolo:
BRAIN RESEARCH, GENDER, AND SEXUAL ORIENTATION
Autore:
SWAAB DF; GOOREN LJG; HOFMAN MA;
Indirizzi:
NETHERLANDS INST BRAIN RES,MEIBERGDREEF 33 1105 AZ AMSTERDAM NETHERLANDS UNIV AMSTERDAM AMSTERDAM NETHERLANDS FREE UNIV AMSTERDAM AMSTERDAM NETHERLANDS
Titolo Testata:
Journal of homosexuality
fascicolo: 3-4, volume: 28, anno: 1995,
pagine: 283 - 301
SICI:
0091-8369(1995)28:3-4<283:BRGASO>2.0.ZU;2-W
Fonte:
ISI
Lingua:
ENG
Soggetto:
HOMOSEXUAL MEN; DIMORPHIC NUCLEUS; PREOPTIC AREA; SUPRACHIASMATIC NUCLEUS; PLASMA TESTOSTERONE; CIRCADIAN-RHYTHMS; MATERNAL STRESS; DIFFERENTIATION; RATS; DIFFERENCE;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Physical, Chemical & Earth Sciences
Citazioni:
53
Recensione:
Indirizzi per estratti:
Citazione:
D.F. Swaab et al., "BRAIN RESEARCH, GENDER, AND SEXUAL ORIENTATION", Journal of homosexuality, 28(3-4), 1995, pp. 283-301

Abstract

Recent brain research has revealed structural differences in the hypothalamus in relation to biological sex and sexual orientation. Differences in size and cell number of various nuclei in the hypothalamus forhomosexual versus heterosexual men have recently been reported in twostudies. We have found that a cluster of cells in the preoptic area of the human hypothalamus contains about twice as many cells in young adult men as in women, We have called this cluster the sexually dimorphic nucleus (SDN). The magnitude of the difference in the SDN depends on age. In other human research, two other hypothalamic nuclei (interstitial nuclei of the anterior hypothalamus [INAH] 2 and 3) and part of the bed nucleus of the stria terminalis (BST) have been reported to besexually dimorphic in the human. Sexual differentiation of the human brain takes place much later than originally claimed. At birth the SDNcontains only some 20% of the cells found at 2 to 4 years of age. Thecell number rapidly increases in boys and girls at the same rate until 2 to 4 years of age. After that age period, a decrease in cell number takes place in girls, but not in boys. This causes the sexual differentiation of the SDN. This postnatal period of hypothalamic differentiation indicates that, in addition to genetic factors, a multitude of environmental and psychosocial factors may have profound influence on the sexual differentiation of the brain. No difference in SDN cell number was observed between homosexual and heterosexual men. This finding refutes Dorner's hypothesis that homosexual males have a ''female'' hypothalamus. However, in a sample of brains of homosexual men we did find that an area of the hypothalamus called the suprachiasmatic nucleus(SCN) contains twice as many cells as the SCN of a heterosexual group. A recent report by Le Vay claims that another nucleus, INAH-3, is more than twice as large in heterosexual as in homosexual men, whereas Alien and Gorski found that the anterior commissure was larger in homosexual men than in heterosexual men or women. Preliminary research on male-to-female transsexuals is also discussed. The functional implications of these findings in determining adult sexual orientation are as yet far from clear.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 03/12/20 alle ore 15:29:16