G - Atypical gender development Flashcards
Gender dysphoria
Chronic distress due to perception of sex and gender mismatch - this excludes intersex conditions, which are biologically verifiable.
A psychiatric condition listed in the DSM-V. Individuals experience a sense of dysphoria (confusion) about their gender because they have strong, persistent feelings of identification with the opposite gender and discomfort with their own. It is only diagnosed where there is no physical intersex condition.
Where does gender identity disorder (GID) first appear?
In DSM-III (1980).
What is an issue of gender identity disorder?
Culture bias is identified - Samoan culture has three genders (extra feminine male category) and none are at risk of any psychological disorder.
Social construct of gender in Western countries changes over time.
What does the DSM-V (2013) replace GID with?
The term Gender Dysphoria (spectrum)
What are the biological explanations of gender dysphoria?
- Transexual gene
- The brian-sex theory
- Phantom limb and cross-wiring
- Environmental effects (pesticides)
Explain the transexual gene as a biological explanation of gender dysphoria
Hare et al. (2009) looked at the DNA of 112 M–>F transexuals.
- Found they were more likely to have a longer version of the androgen receptor gene than in ‘normal’ sample.
- The effect of this abnormality is reduced action of the male sex hormone testosterone, and this may have an effect on gender development in the womb (e.g. under-masculinising the brain).
- Transexuals brain may be much less masculine than average, if the threshold level for masculine development is never reached.
What are the effects of the transgender gene on M–>F transexuals?
- Androgen receptor gene longer.
- This difference reduces the ability of testosterone to cause changes in development.
- Transexuals brain may be much less masculine than average, if the threshold level for masculine development is never reached.
Explain how your fingers link to testosterone levels
Longer ring finger than index finger = more testosterone.
What is the brain-sex theory based on?
The fact that male and female brains are different and perhaps transsexuals’ brains do not match their genetic sex.
Explain what has been found in the brain-sex theory as a biological explanation of gender dysphoria
BSTc (bed nucleus of stria terminalis) is twice the size in straight men than women and contains twice the number of neurons.
- It integrates info from across the limbic system.
- The info is used to monitor stress-readiness levels (allostatic valence).
BSTc size correlates with preferred sex, not biological sex.
- Dutch studies (Zhou et al., 1995 and Kruijver et al., 2000) found that the number of neurons in the BSTc (and its size) of M–>F transexuals was similar to that of the female average and the number of neurons in/ the size of the BSTc in F–>M transexuals is usually within the typical male range.
What part of the brain is the brain-sex theory related to?
The BSTc (bed of stria terminalis).
What differs about the BSTc in men and women?
BSTc (bed nucleus of stria terminalis) is twice the size in straight men than women and contains twice the number of neurons.
- It integrates info from across the limbic system.
- The info is used to monitor stress-readiness levels (allostatic valence).
Explain how BSTc size correlates with preferred sex
BSTc size correlates with preferred sex, not biological sex.
- Dutch studies (Zhou et al., 1995 and Kruijver et al., 2000) found that the number of neurons in the BSTc (and its size) of M–>F transexuals was similar to that of the female average and the number of neurons in/ the size of the BSTc in F–>M transexuals is usually within the typical male range.
What does size of the BSTc correlate with?
Preferred sex not biological sex.
What does the diathesis stress and gender link say the very few stable behavioural difference between men and women are?
- Brains are not 100% masculine or 100% feminine.
- Male brains are larger than female brains.
- Females have a proportionally thicker cortex and more grey matter/less white matter when compared with men.
- Men have larger ventricles (glymphatic system).
What is different about the amount of grey and white matter between men and women?
Females have a proportionally thicker cortex and more grey matter/less white matter when compared with men.
Which gender has a larger glymphatic system/larger ventricles?
Men
Which gender has the largest brain?
Men
Are brain either 100% masculine or 100% feminine?
No
What does the diathesis-stress theory as a biological explanation of gender dysphoria say about the effects of stress on the brain?
Stress can change the sex of brain regions in less than 15 minutes.
- Typical female neurons have more dendritic spines than male neurons (important for firing/processing speed).
- After 15 mins of stress, researchers found a reversal in this pattern in the rat hippocampus.
- Therefore, physical structure of brain cells can’t determine sex - you need to know whether there was high or low stress.
- Many environmental factors have been shown to change the default sex of developing brain regions (e.g. all stages of life, size of social group, level of environmental stimulation).
What are the biological explanations of gender dysphoria?
Transsexual gene
The brain-sex theory
Phantom limb and cross-wiring
Environmental effects - pesticides