Perspectives in Psychology
- Created by: Ellie_Terrett1
- Created on: 19-03-22 11:07
Sex and gender
Sex is biological aspects
- Chromosomes
- Genitalia
- Sexual identity
Gender is social aspects
- Identity
- Gender role
There are strong opinions on the differences between males and females, people can get fired from jobs, canceled for saying there's a difference
David/Brenda Reimer
Born male, genitalia replaced at 2 months, raised as a girl, told of incident and reassumed male identity
Development differences
Girls
- More time spent working (diligent)
- Better verbal abilities
- More time grooming
- More infant contact and play
- Greater attention to faces
Boys
- More time spent playing
- Better spatial abilities
- Better arithmetic reasoning
- Greater physical aggression
- Greater attention to mechanical movements
Reproduction
Bateman's principle
- Male reproductive success depends on the number of mates
Men report more sexual partners and hold more sexually permissive attitudes
More likely to have sex in a shorter period of time
More likely to agree to casual sex
r=0.66 for men r=0.26 for women
looking at physiological cues of arousal snd reported arousal correlation
Females may have automatic genital response - lubrication could be a defense mechanism
Other sex differences
Men prefer youth and health in partners
Women prefer resources and social status in partners
Men are more likely to commit violent crimes
Tempers may flare when there's competition
Men more likely to engage in risky behaviour
Risk can sometimes reap rewards
Men and women have different personalities
16 personality factors showed effect size of 2.7 (Very large)
Men have a higher concentration of testosterone
- makes them more sexually motivated, energetic, aggressive
Difference in toys chosen (humans and monkeys
Men more likely to do STEM in some countries
Gender similarity hypothesis
Has since been disproven
Hyde
There are differences but also similarities between genders
e.g, overlap in height differences
Hyde argues that 77% of psychological sex differences are only very slight
Testosterone
Testosterone changes development in foetus
Congenital adrenal hyperplasia - overexposed to testosterone
- more male behavior
- more likely to be attracted to females
- less preference in sex of friends
- slower language development
- less eye contact
Thoughts that testosterone could be linked to autism
Bateman's principle
Darwin suggested that males were eager as the costs of transporting sperm was lower than the costs of transporting eggs for females
Bateman found that in a specific species of fruit fly, the number of offspring increased with the number of mates for males
He predicted that this was because single eggs are more costly to produce than single sperm, so the number of offspring was limited by the ability to produce eggs
Trivers drew attention to postzygotic parental investment - feeding young, defending against predators
Predicted that the limiting factor would be the sex with the largest parental investment
- Males showed greater variance in number of offspring
- Males showed greater variance in number of sexual partners
- There was a stronger relationship between reproductive success and mating success in males
Sexual selection will only take place if the likelihood of success is dependent on possession of a particular trait
Bateman's principle continued
Bateman's gradient = regression line between reproductive success and mating success
Sex with steepest gradient faces strongest selection pressures on traits that better mating success
Relationships between reproductive success and mating success
linear
single-mate saturation
diminishing returns
intermediate optimum
Females can benefit from multiple matings
- reduced infanticide risk, assurance of fertilisation, material gains, genetic benefits
Males can be more prudent due to energetic costs of sperm production, courtship, copulation
Intense competition in one sex doesn't necessarily lead to choosiness in the other
Females choosy when male heavy, little paternal investment, considerable variation in quality
Males choosy when female heavy, a lot of paternal investment, considerable variation in quality
Both sexes choosy when encounter rates are high
Neither sex is choosy when low encounter rates
Humans with regards to Bateman's principle
Males exhibit higher mean variation in reproductive success
Large inter-population variation in ratio of male and female variance in reproductive success
Serial monogamous societies have similar ratios to polygynous
Ratio of variance in male and female success is greatest when male mating success varies more
Western societies, men more likely to remarry than women
- longer reproductive lifespan
Polygynous societies more common, though rare for males to actually take on more than 1 wife
If parental investment high, polygyny is costly and increases in reproductive sucess are not linear
Mate saturation/diminishing returns
Strong positive correlation found between wealth and reproductive succes in modern and traditional societies
Strong female cpmetition occurs when high variation in male quality
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