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Gender identity is a person's private sense of, and subjective experience of, their own gender. This is generally described as one's private sense of being a man or a woman, consisting primarily of the acceptance of membership into a category of people: male or female. All societies have a set of gender categories that can serve as the basis of the formation of a social identity in relation to other members of society. In most societies, there is a basic division between gender attributes assigned to males and females. In all societies, however, some individuals do not identify with some (or all) of the aspects of gender that are assigned to their biological sex.
In most Western societies, there exists a gender binary, a social dichotomy that enforces conformance to the ideals of masculinity and femininity in all aspects of gender and sex - gender identity, gender expression and biological sex. Some societies have so-called third gender categories that can be used as a basis for a gender identity by people who are uncomfortable with the gender that is usually associated with their sex; in other societies, membership of any of the gender categories is open to people regardless of their sex.
While many may think gender identity develops when a child is going through puberty, gender identity in children generally begins to form at age three or between the ages of four and six. Gender identity is affected by influence of others, social interactions, and a child’s own personal interest. Understanding gender can be broken down into four parts: (1) understanding the concept of gender, (2) learning gender role standards and stereotypes, (3) identifying with parents, and (4) forming gender preference (Newman 243). A three year old can identify themselves as a boy or a girl, though they do not yet know gender is permanent.
Gender identity is formed as children search for social cues and display approval for others based upon the gender with which the child identifies, though gender identity is very fluid among young children. Studies suggest that children develop gender identity in three distinct stages: as toddlers and preschoolers, they learn about defined characteristics, which are socialized aspects of gender; the second stage is consolidation, in which identity becomes rigid, around the ages of 5–7 years; after this "peak of rigidity," fluidity returns and socially defined gender roles relax somewhat.
Although the term "gender identity" was originally a medical term used to explain sex reassignment surgery to the public, it is most often found in psychology today, often as core gender identity. Basic gender identity is usually formed by age three and is extremely difficult to change after that. Although the formation of gender identity is not completely understood, many factors have been suggested as influencing its development. Biological factors that may influence gender identity include pre- and post-natal hormone levels and genetic makeup. Social factors which may influence gender identity include ideas regarding gender roles conveyed by family, authority figures, mass media, and other influential people in a child's life. Another factor that has a significant role in the process of gender identity is language, there are ways that certain words are associated with specific genders, "The relationship between language and gender has largely reflected how linguistic practices, among other kinds of practices, are used in the construction of social identities relating to issues of masculinity and femininity." (Adegoju,2000).[full citation needed] So children while learning a language learn to separate masculine and feminine characteristics and unconsciously adjust their own behavior to these predetermined roles. Children are often shaped and molded by the people surrounding them by trying to imitate and follow. One's gender identity is also influenced by the social learning theory, which assumes that children develop their gender identity through observing and imitating gender-linked behaviors, and then being rewarded or punished for behaving that way. In some cases, a person's gender identity may be inconsistent with their biological sex characteristics, resulting in individuals dressing and/or behaving in a way which is perceived by others as being outside cultural gender norms; these gender expressions may be described as gender variant or transgender.
Since the development of gender identity is influenced by so many factors, it is understandable that there are disorders and conditions associated with it as well. One of the major disorders is gender identity disorder (GID). Gender identity disorder is defined by strong, persistent feelings of identification with the opposite gender and discomfort with one's own assigned sex. The Diagnostic and Statistical Manual of Mental Disorders (302.85) has five criteria that must be met before a diagnosis of gender identity disorder can be made. "In gender identity disorder, there is discordance between the natal sex of one's external genitalia and the brain coding of one's gender as masculine or feminine." Interestingly, gender identity disorder is also made up of more specific disorders, each of which focuses on the disorder in people of certain age groups. For example, gender identity disorder in children is specific to children who experience gender dysphoria.
Gender identity, appearance and chromosomes 
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Many people consider themselves to be cisgender, that is, belonging to either the man or woman gender corresponding to their assigned sex of male or female. Before the 20th century, a person's sex would be determined entirely by the appearance of the genitalia, but as chromosomes and genes came to be understood, these were then used to help determine sex. Those defined as women, by sex, have genitalia that is considered female, as well as two X chromosomes; those viewed as men, by sex, are seen as having male genitalia, one X and one Y chromosome. However, some individuals have a combination of these chromosomes, hormones, and genitalia that do not follow the traditional definitions of "men" and "women". In addition, genitalia vary greatly or individuals may have more than one type of genitalia. Also, other bodily attributes related to a person's sex (body shape, facial hair, high or deep voice, etc.) may or may not coincide with the social category, as man or woman. For example, a person with female genitalia, as well as a deep voice and facial hair, may have difficulty determining which gender they identify with. A survey of the research literature from 1955–2000 suggests that as many as one in every hundred individuals may have some intersex characteristic. Intersex phenomena are not unique to humans. In a number of species, even more striking examples exist, for instance the bilateral gynandromorphic zebra finch (half-male, half-female body along its symmetry plane).
History and definitions 
Conceptual origins 
In 1905, Sigmund Freud presented his theory of psychosexual development in Three Essays on the Theory of Sexuality. Freud gave evidence to the fact that in the pregenital phase children do not distinguish between genders or sexes: they assume both parents have the same genitalia and the same reproductive powers. On this basis, he inferred that bisexuality is the original sexual orientation, and that heterosexuality is resultant of repression during the phallic stage, at which point gender identity is ascertainable. According to Freud, during this stage, children develop an Oedipus complex where they have sexual fantasies for the parent ascribed the opposite gender and hatred for the parent ascribed the same gender. This hatred transforms into (unconscious) transference and (conscious) identification with the hated parent who both exemplifies a model to appease sexual impulses and threatens to castrate the child's power to appease sexual impulses. In 1913, Carl Jung proposed the Electra complex as he both believed that bisexuality did not lie at the origin of psychic life, and that Freud did not give adequate description to the female child. This proposal, however, was rejected by Freud.
During the 1950s and '60s, psychologists began studying gender development in young children, partially in an effort to understand the origins of homosexuality (which was viewed as a mental disorder at the time). In 1958, the Gender Identity Research Project was established at the UCLA Medical Center for the study of intersexuals and transsexuals. Psychoanalyst Robert Stoller generalized many of the findings of the project in his book Sex and Gender: On the Development of Masculinity and Femininity (1968). He is also credited with introducing the term gender identity to the International Psychoanalytic Congress in Stockholm, Sweden in 1963. Behavioral psychologist John Money was also instrumental in the development of early theories of gender identity. His work at Johns Hopkins Medical School's Gender Identity Clinic (established in 1965) popularized an interactionist theory of gender identity, suggesting that, up to a certain age, gender identity is relatively fluid and subject to constant negotiation. His book Man and Woman, Boy and Girl (1972) became widely used as a college textbook, although many of Money's ideas have since been challenged. In the late 1980s, Judith Butler began lecturing regularly on the topic of gender identity and, in 1990, published her seminal work Gender Trouble: Feminism and the Subversion of Identity, which imported significant contributions from philosophy after the late 1950s and led to a radical critique of the inadequacies in feminism. Butler's central thesis argues that gender identity does not oppose sexual biology but, on the contrary, performs the possibility of something otherwise than male or female. Gender Trouble is often regarded as the most groundbreaking work on feminist theory and gender studies.
While the term gender identity generally refers to gender and sex categories, other scholars additionally use the term to refer the sexual orientation and sexual identity categories gay, lesbian and bisexual.
Medical literature 
Women who chose not to conform to their expected gender roles were called "inverts", and they were portrayed as having an interest in knowledge and learning, and a "dislike and sometimes incapacity for needlework". During the mid 1900s, doctors pushed for corrective therapy, which meant that gender behaviors that weren't part of the norm would be changed. The aim of this therapy was to push children back to their "correct" gender roles, and thereby limiting the amount of children becoming transgender.
In the DSM 
|This section requires expansion with: brief summary of controversy. (October 2010)|
The notion of gender identity appeared in the Diagnostic and Statistical Manual of Mental Disorders in its third edition, DSM-III (1980), in the form of two psychiatric diagnoses of gender dysphoria: gender identity disorder of childhood (GIDC), and transsexualism (for adolescents and adults). The 1987 revision of the manual, the DSM-III-R added a third diagnosis: gender identity disorder of adolescence and adulthood, nontranssexual type. This latter diagnosis was removed in the subsequent revision, DSM-IV (1994), which also collapsed the GIDC and transsexualism in a new diagnosis of gender identity disorder.
The authors of a 2005 academic paper questioned the classification of gender identity problems as a mental disorder, speculating that certain DSM revisions may have been made on a tit-for-tat basis when certain groups were pushing for the removal of homosexuality as a disorder. This remains controversial, although the vast majority of today's mental health professionals follow and agree with the current DSM classifications.
International Human Rights Law 
The Yogyakarta Principles, which is a document on application of international human rights law, provides definition on gender identity. In the preamble, "gender identity" is understood to refer to each person's deeply felt internal and individual experience of gender, which may or may not correspond with the sex assigned at birth, including the person's sense of the body (which may involve, if freely chosen, modification of bodily appearance or function by medical, surgical or other means) and other experience of gender, including dress, speech and mannerism. Further, in Principle 3, that "each person's self-defined gender identity is integral to their personality and is one of the most basic aspects of self-determination, dignity and freedom. No one shall be forced to undergo medical procedures, including sex reassignment surgery, sterilization or hormonal therapy, as a recognition of their gender identity." and in Principle 18, that "Notwithstanding any classifications to the contrary, a person's gender identity are not, in and of themselves, medical conditions are not to be treated, cured or suppressed." Relating to this Principles, "Jurisprudential Annotations to the Yogyakarta Principles" states that "Gender identity differing from that assigned at birth, or socially rejected gender expression, have been treated as a form of mental illness. The pathologization of difference has led to gender-transgressive children and adolescents being confined in psychiatric institutions, and subjected to aversion techiniques -including electroshock therapy - as a "cure"". And "Activist's Guide to the Yogyakarta Principles" stresses that "it is important to note that while "sexual orientation" has been declassified as a mental illness in many countries, "gender identity" or "gender identiy disorder" often remains in consideration." These Principles influenced the UN declaration on sexual orientation and gender identity.
Present views 
This generation is the first that accepts boys openly playing with and dressing in things normally seen for girls, to different extents. There are new ideas to limit the traditional views of only boy and girl as genders, such as the "middle space" or a gender spectrum. Both of these theories believe that there are more than two options for gender (Padawer, 2012). Our society is becoming much more accepting to gender nonconformity than it has been in the past, and it is still attributed to different causes. There are hundreds of different beliefs within our society as to what is the main foundation of gender development.
Gender identity and related topics are constantly debated within politics. Recently, it was decided under the Affordable Care Act that health insurance exchange's will have the ability to collect demographics regarding gender identity and sexual identity within the effected populations. The questions will be optional, but will help policymakers better recognize the needs of the LGBT community, and prove that the goal is to provide insurance for everyone. The questions are legal, and federal policies promise that nobody will be discriminated against.
Medical field 
Today, there is some changing views and new discrepancies about the best way to deal with gender nonconformity. Many members of the medical field, as well as an increasing number of parents, no longer believe in the idea of corrective therapy. Instead, psychologists and psychiatrists suggest that instead gender neutrality should be encouraged, in which people are not distinguished by their gender. It is believed that this will lead children to be more comfortable with themselves and their feelings. On the other hand, there is still large number of clinicians who believe that there should be interventions for gender nonconforming children. They believe that stereotypical gender-specific toys and games will encourage children to behave in their traditional gender roles.
Transsexual self-identified people sometimes wish to undergo physical surgery to refashion their primary sexual characteristics, secondary characteristics, or both, because they feel as if they will be more comfortable with different genitalia. This may involve removal of penis, testicles or breasts, or the fashioning of a penis, vagina or breasts. In the past, sex assignment surgery has been performed on infants who are born with ambiguous genitalia. However, current medical opinion is strongly against this procedure, since many adults have regretted that these decisions were made for them at birth. Today, Sex reassignment surgery is performed on people who choose to have this change so that their sexual identity will match their gender identity. Once this change is successful, the participant usually feels much more comfortable with themselves.
Gender identity and sex 
When the gender identity of a person makes them one gender, but their genitals and their body's secondary sex characteristics suggest a different sex, they will likely experience what is called gender dysphoria. Some people do not believe that their gender identity corresponds to the sex they were assigned at birth, including transsexual people, transgender people, and many intersexed individuals. Consequently, complications arise when society insists that an individual adopt a manner of social expression (gender role) which is based on sex, that the individual feels is inconsistent with that person's gender identity. Complications can also arise with the stereotyping, or gender typing of behavior for individuals for behavior related to a specific sex, when they identify as a different gender. This dissonance can lead to gender identity disorder.
One reason for such discordances in intersexed people is that some individuals have a chromosomal sex that has not been expressed in the external genitalia because of hormonal or due to other abnormal conditions during critical periods in gestation. Such a person may appear to others to be of one sex, but may recognize himself or herself as belonging to the other sex. The causes of transgenderism are less clear; it has been subject of much speculation, but no psychological theory has ever been proven to apply to even a significant minority of transgender individuals, and theories that assume a sex difference in the brain are relatively new and difficult to prove, because at the moment they require a destructive analysis of inner brain structures, which are quite small.
In recent decades it has become possible to surgically reassign sex. A person who experiences gender dysphoria may then seek these forms of medical intervention to have their physiological sex match their gender identity. Alternatively, some people who experience gender dysphoria retain the genitalia that they were born with (see transsexual for some of the possible reasons), but adopt a gender role that is consistent with what they perceive as their gender identity.
Influencing factors 
Biological factors 
Some of the research we see today suggests that the development of gender identity is related to genetic or hormonal influences. When prenatal hormone levels are altered, phenotype progression may be altered as well. Therefore, the natural predisposition of the brain toward one sex may not match the genetic makeup of the fetus, or its external sexual organs. Numerous conditions and variations that have their basis in the prenatal stage can ultimately affect one's gender identity. Possible conditions may result from chromosomal alterations, in which the child doesn't have the normal two chromosomes of XX (female) or XY (male).
One study conducted by Reiner & Gearhart provides some insight into what can happen when genetically male children are sexually reassigned female and raised as girls. In a sample of 14 children born with cloacal exstrophy and reassigned female at birth, follow-up between the ages of 5 to 12 showed that 8 of them identified as boys, and all of the subjects had at least moderately male-typical attitudes and interests. This provides some support for the argument that biological variables have an impact on gender identity and behavior independent of socialization.
Furthermore, evidence suggests that differences in verbal and spatial abilities, memory and aggression are linked to differences in hormone secretions between males and females. One study claims that gender identity may be influenced by “hormonal imprinting” before birth, so that prenatal androgenization for example (exposure to high levels of androgen before birth) may lead to more masculine behavior. Importantly, however, prenatal androgenization has not been found to lead necessarily to male gender identity development. A recent study moves beyond hormones to examine so-called "direct effects" of genes located on the X and Y chromosomes. Mediated by brain functioning, these genes are linked to aggression, impulsivity, play behavior and language skills.
Some studies have tried to establish a link between biological variables and transgender or transsexual identity, but such studies have been limited and their findings largely uncertain. Zhou et al. suggested in 1995 that a sex difference in the central subdivision bed nucleus of the stria terminalis (BSTc) may serve as a biological marker for gender identity, as the volume of BSTc is larger in males than in either females or male-to-female (MtF) transsexual women.
Other research suggests that the same hormones that allow for differentiation between sex organs in utero also elicit puberty, as well as influence the development of gender identity. Different amounts of these male or female sex hormones within a person will result in varied behavior and external genitalia that do not match up with the norm of the actual sex, and they may instead act and look like the opposite gender.
Social and environmental factors 
Gender identity also has a strong correlation to social and environmental factors, such as what type of parents raise the child and what kind of culture they grow up in. Parents and authoritative figure's views on sexuality and gender will have a great influence on children's behaviors, interests, and self-identity. Children learn by observation and reproductions, and will repeat actions and ideas that they see from the adults in their lives. Parents who do not support gender nonconformity are more likely to have children with firm views on gender identity as well as stricter views regarding gender roles.
The environment in which a child is raised in regards to gender is created before the child is even born. Current technology, such as an ultrasound, allows the parents to find out the biological sex of the child before he or she is born and to alter their preparation as parents based on what they find. The child arrives to a decided gender-specific name, games, and even ambitions. When the child's sex is determined, most children are raised to be a man or a woman, with the related social roles based on the parents' beliefs. Anthropologist LaFreniere states, "By the time children are 3 to 4 years old, they have already formed an image of themselves as boy or girl." Children form these thoughts through parents, teachers, peers, and the games and toys that they play with at a young age. Sociologist Doob states that by the age of 5, girls show a preference for dolls, doll accessories, drawing, painting, and soft toys while boys will tend to prefer blocks, small vehicles, tools and rough-house play.
Nature vs. nurture 
The extent to which gender identity is determined by socialization (environmental factors) versus in-born (biological) factors is an ongoing debate in psychology, known as nature versus nurture. While gender roles and sex differences are both largely recognized as influential in behavior, it is often difficult to determine the separate impacts of socialization and genetic variables.
Although there may be discrepancies as to which factor plays the most important role, there is extensive agreement that a combination of many different views and perspectives are needed for a complete understanding of gender development.
The idea of nature verses nurture has had quite an effect on gender identity. Nature has to do with the hormonal aspect and the genetic make up. Certain genetic variations may produce gender-variant identities. Gender identity development has genetic influence (Dragowski). The second aspect is nurture, which has to do with environmental aspects and parental influence of genetic identity. Parents are the ones who create the values and behaviors that their children create. Most parents tend to surround their children with gender-typed toys and clothes. One of the most known examples of nature verses nurture was the case of David Reimer, otherwise known as “John/Joan”. As a baby, David went through a faulty circumcision, losing his male genitalia and from then on he was designed to be a girl. Psychologist John Money convinced Reimer’s parents to raise David as a girl. Reimer grew up as a girl dressing in girl clothes and was surrounded by girl toys, but he still felt as though something was wrong. David did not feel like a girl and after trying to commit suicide by age 13, Reimer was then told he was born a boy. Once he was told the truth, he immediately went into surgery to get the proper genitalia back. This went against Money’s idea that biology had nothing to do with gender identity or human sexual orientation.
Non-Western gender identities 
In some Polynesian societies, fa'afafine are considered to be a "third gender" alongside male and female. They are biologically male, but dress and behave in a manner considered typically female. According to Tamasailau Sua'ali'i (see references), fa'afafine in Samoa at least are often physiologically unable to reproduce. Fa'afafine are accepted as a natural gender, and neither looked down upon nor discriminated against. Fa'afafine also reinforce their femininity with the fact that they are only attracted to and receive sexual attention from straight masculine men. They have been and generally still are initially identified in terms of labour preferences, as they perform typically feminine household tasks. The Samoan Prime Minister is patron of the Samoa Fa'afafine Association.
Translated literally, fa'afafine means "in the manner of a woman." In some cultures of Asia,a hijra is usually considered to be neither a man nor a woman. Most are biologically male or intersex, but some are biologically female. The hijra form a third gender, although they do not enjoy the same acceptance and respect as males and females in their cultures. They can run their own households, and their occupations are singing and dancing, working as cooks or servants, sometimes prostitutes (for men), or long-term sexual partners for men. Hijras can be compared to transvestites or drag queens of contemporary western culture.
The xanith form an accepted third gender in Oman, a gender-segregated society. The xanith are male homosexual prostitutes whose dressing is male, featuring pastel colors (rather than white, worn by men), but their mannerisms female. Xanith can mingle with women, and they often do at weddings or other formal events. Xaniths have their own households, performing all tasks (both male and female). However, similarly to men in their society, xaniths can marry women, proving their masculinity by consummating the marriage. Should a divorce or death take place, these men can revert to their status as xaniths at the next wedding.
See also 
- Gender bias
- Gender binary
- Gender differences
- Sex/gender distinction
- Queer theory
- Queer studies
- Identity (social science)
- List of transgender-related topics
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