The Homosexual Brain?
In 1992, Vice-President Dan Quayle said that homosexuality "is more of a choice than a biological situation...It is a wrong choice." (1). Quayle's statement counters the sentiment of many homosexuals that their sexual orientation is neither a lifestyle nor a personal choice, it is innate and unchangeable (2) . Is homosexuality a choice or does sexual preference have a biological basis? This question is at the forefront of academic, scientific, political, legal and media consciousness (3). The debate over homosexuality has influenced a myriad of research in finding a biological cause for differences in sexual behavior.
The quest to find a biological substrate for homosexuality resembles an earlier movement in
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Prenatal and perinatal hormones organize the components of the brain and create either a male or female brain and thereby produce male or female typical behavior (5). The most sexually dimorphic region of the brain is located in the hypothalamus. The sexually dimorphic nucleus of the preoptic area (SDN-POA) is the most differentiated portion of the brain between sexes. In humans, the SDN is twice as large in young adult men than it is in women. The SDN-POA also plays an essential role in the secretion of gonadotropin, maternal behavior, and sexual behavior in many mammals and therefore implies that it is critical in human sexual behavior. There are four cell groups located in this preoptic-anterior hypothalamic area. These four groups have been termed the Interstitial Nuclei of the Anterior Hypothalamus (INAH 1-4). Research done on these cell groups shows that the INAH-3 is about three times larger in the male brain than it is in the female brain (6). The INAH-2 is twice as large in the male brain than the female brain (6). The importance of these regions in sexual differentiation (between the sexes) led scientists to believe that sexual orientation could be on a continuum in this area of neurological research (7).
>From this previous work on the anterior hypothalamus, LeVay hypothesized that the INAH 2 or 3 would be larger in men who sexually prefer women than
One theory that many psychologist and scientist are trying to prove is that homosexuality has a fundamental biological basis. Similar to most mammalian species, humans at conception are females (McKnight 22). Toward the end of the first trimester is when the babies with a “male genetic message” begin to have small doses of two hormones, chorionic gonadotropin and luteinizing hormone, which start the altering process of the gonads into testes (McKnight 22). The hormones two jobs are to control the sexual development and control their function (McKnight 22). When the brain starts to develop masculine characteristics and lose the feminine characteristics, the processes are separate and occur at different
He contradicted the argument that homosexual behaviour is related to genetic, hormonal or biological disorder. To abolish these views, the author mentions that ‘no school of medicine, medical journal or professional organization has ever recognized such claims (p. 2) - at least at the time he wrote the article in 1994.
Focusing on just natural clarifications of human conduct, the Biological Theory trusts that physiological variables tremendously affect sexual conduct. Scholars regularly take a gander at anomalous hormonal and androgenic levels in the body and cerebrum to depict freak sexual practices as in rising hormones are identified with physical changes that advance sexual excitement, climax, discharge, and other sexual movement. "In spite of the fact that a survey of natural studies indicates clashing results about the relationship between
A pattern emerges where the scholarly literature exploring this topic is largely focused on males. Reason being is that it appears that males are the sex who are predominantly homosexual in their orientation (LeVay & Baldwin, 2012). However, the sensitivity within the discourse of sexual orientation arises when it is debated upon whether one 's sexual preference is innate at birth, hence a force of nature or biology, or if it is a result of culture, nurture or environmental factors (Emmanuele et al., 2010). Furthermore, an experimental design will be proposed to further examine this topic. Comparing the three chosen studies, it is evident that a biological and endocrinological perspective does account for sexual orientation (Kraemer et al., 2006; Manning et al., 2007; Miller et al., 2008). Of the studies that currently exist on this topic, data shows that prenatal testosterone levels are indicative of sexual orientation (Kraemer et al., 2006; Manning et al., 2007; Miller et al., 2008). This paper addresses a topic that is relevant in today 's society; a topic that has, for the most part, been written off as having any scientific roots (Emmanuele et al., 2010). This paper counters that belief and in reading this essay, it will be evident that biology and endocrinology have a much stronger influence on sexual orientation than previously thought.
It is a fair assumption to say that America is approaching a new age in understanding and accepting the many variations of human sexual orientation. More same-sex couples have fostered children than ever before in our nation 's history. Institutions such as military and professional sports have (slowly but surely) began to accept openly gay members. Most importantly, a recent amendment to the Marriage Act of 1961 now defines marriage as a union of two people; an amendment which removed the prohibition of same-sex marriages. These landmarks in the progression of social awareness surrounding sexual orientation are derivative of scientific findings disputing the "choice" theory. As outlined in Simon LeVay 's book, Gay, Straight, and the Reason Why, the result of someone 's sexual orientation "emerges from the prenatal sexual differentiation of the brain" (LeVay 2011: 271) What LeVay means in this context is, "whether a person ends up gay or straight depends in large part on how this process of biological differentiation goes forward, with the lead actors being genes, sex hormones, and the brain systems" (LeVay 2011: 271). Much research, proven and theoretical, has been done on the concept of what makes people gay. Many factors surrounding socialization in regards to sexual orientation have undergone extensive scientific scrutiny (LeVay 2011: 77). Although there is evidence that suggests social and environmental elements play a role in sexual orientation, it is
In one article by Marcia Malory, “Homosexuality & Choice: Are Gay People ‘Born This Way’”, she goes into multiple studies on the genetics of a gay child's parents. A study conducted in 1993 the “gay gene” matter arose when it was looked into the homosexual children's parents having a different X chromosome marker. Nonetheless genes do not control our behavior completely as does environment. The brain may also play a role in sexual preference, like the study in 1991 showing the difference in neurons and pituitary glands. Later in the 2000s more studies showed that gay men have more symmetrical hemisphere and amygdala resembles that of women's. The brain develops in the womb and continues through late adulthood. When did a fetus choose its
"If you give a female rat a short burst of testosterone shortly after birth you end up with a female that demonstrates male behaviour. But there is a lot of argument about whether a similar thing occurs in humans."
A highly debated issue concerning homosexuality is whether sexual-orientation is biologically determined or if it is a socially learned behavior. One case study done about this topic gathered that “the homosexual desire seems in most cases to be implanted in those who develop an unusually strong attachment for one parent” (Cory 1951:67). This seems to suggest that homosexuality can be influenced by family structure or other sociological elements. On the other side of this argument, there is the belief that people are born either gay or straight. Even though there is no scientific or genetic evidence to prove this, there have been many studies done and most homosexuals interviewed take this view-point. McIntosh states, “[homosexuality] is still commonly seen as a condition characterizing certain persons in the way that birthplace or deformity might characterize them” (1968:182). To support their cause and to fight for acceptance in society, it would be beneficial to convince people that sexual orientation is biologically determined. “Research indicates that people who believe that homosexuality is a choice are more likely to condemn it than are those who believe gays and lesbians are born that way”
Many people now believe the reporting of many popular newspapers and magazines report of the "discovery" of a link between a certain gene and homosexuality, but hasn't it been considered a choice for such a long time? Is homosexuality a choice rather than genetic? To answer this question we'll start off by revealing some myths of homosexuality. The next part will explain the difference between a behavioral trait and a genetic trait. Finally I'll end be unveiling the truth behind the "homosexual gene."
For many years, psychologists described homosexuality as a disorder or a treatable complex. Recently, homosexuality was removed from the DSM and is no longer considered a disorder. The gay population is no longer treated as sick but accepted as a diverse set of individuals. The many distinguishing attributes and characteristics of a gay or lesbian individual are considered to be personality attributes.
Prior to the twenty-first century, homosexuality was viewed as a mental disorder that required treatment. Both counseling and aversion therapy were exercised in attempts to “cure” individuals of their sexuality. The brutal process consisted of shock therapies, lobotomies, castrations, and drugs (Scot, 2013). A device that was commonly used was the Farrall Instrument, which functioned by showing an individual of the same sex and delivering a shock until a button was pressed to deliver another slide. The slides of the opposite sex did not deliver a shock; therefore, an association with those of the same sex would become negative and the patient receiving the treatment would become heterosexual. These practices were enacted until 1973 when the American Psychiatric Association declassified homosexuality as a mental disorder (Scot, 2013). From that point on, homosexuality increasingly grew in acceptance and still continues to do so in modern society. A variety of places that celebrate members of the LGBT community have been established to help welcome them into society, along with an improvement of the attitudes of others and their treatments towards the communities’ members. However, homophobia and the segregation of LGBT individuals still persists in modern society to prevent their integration into civilization.
Looking at male and females we can see the noticeable physical differences between the two sex, but besides exterior differences, there are subtle but significant differences within the brain. Spasificly INAH3 which is called “third interstitial nucleus of the anterior hypothalamus” which is typically about two to three times larger
A growing body of evidence the sexuality is due to biology, however this is still a controversy. Currently there is little understanding on the time period sexual orientation is programmed. One theory is that homosexual orientation is caused by atypical levels of hormones in utero (Mustanski, Bailey, & Kaspar, 2002 p 114). Research in the past has indicated that handiness is connected to prenatal androgen levels and studies have shown that there is a higher incidence of left handiness when mother were exposed to testosterone increasing agents (Bynny, Orth & Cohan as cited in Mustanski et al., 2002 p.114). One reason this theory has been suggested is that stress when pregnant is directly correlated to increased testosterone and left
The question of what causes some people to be sexually attracted to members of their own gender generates many different answers. In recent years, startling new research (Barinaga, 1993, p.17) has indicated that homosexuality is possibly inherited and determined by biological differences in Brain structure and genes. This study raises an interesting question: If homosexuality is hereditary, is there any basis for societal discrimination against something innate? If it is nature, it is good. If it is good, it should be accepted. A genetic component in sexual orientation would send a message to homosexuals and the society that homosexuality is not a fault, and not the fault of anyone other than nature. Gays and lesbians are born in nature, just like some people who are inherited left-handed gene from their parents.
In today’s day in age, different sexualities and gender identities are quickly becoming more accepted in mainstream society. Despite this change, there are many people who believe that having a different sexual orientation or gender identity is a choice that is frowned upon. In order to refute this belief, research and biology of the brain is necessary. Researching the brain on the basis of sexuality is a fairly new topic of discussion because it is somewhat difficult and confusing. This paper will explore the different identities of gender, sex and sexual orientation and the main biological reasons behind these. There is also some validity of different sexual orientations and identities through the evidence of sexual disorders like