Relationships Flashcards
What is evolution?
The process whereby humans have adapted to the environment over millions of years
What does evolutionary behaviour theory suggest?
That if if we accept human evolution it is logical to assume that our behavioural and physical characteristics have also evolved for out survival
When is a behaviour adaptive?
When it leads to increased survival and reproduction of offspring (continuation of genes)
Thus the same characteristic (behavioural or physical) will be passed on to the next generation
What did Buss’s study aim to do?
To study evolutionary theory about mate selection and assess preferred characteristics of the opposite gender for men + women (across all cultures)
What was the procedure of Buss’s study?
10,047 pps (across 33 countries/37 cultures) av. age: 23.05 yrs, pps completed 2 questionarres-
1st: rank on scale 0-3, 18 different characteristics
2nd: rank 13 factors in order of importance when selecting a mate
(factors included target variables of age, looks, money, chastity, ambition)
What were the findings of Buss’s study?
36/37 cultures women valued good financial prospects,
36/37 women valued industriousness,
All 37 men wanted younger mate
All 37 men valued good looks
23/37 men valued chastity- (This showed most cultural difference)
What is sexual selection?
Suggests evolution is driven by competition for mates and development of characteristics that ensure better chance of reproductive success
(NOT survival success which is natural selection)
What is anisogamy?
The difference between the sex cells: namely that sperm 40-600 million released at any one time whereas ova production limited to about 300
What is inter-sexual selection?
Quality vs quantity (typical “female” strategy) Trivers (1972) suggests female makes more investment in time/resources + stands to lose more so opts for this strategy. Leaves males to compete for the female.
What are indicators?
When one gender is selecting a mate from the other they use indicators: which reveal good genes and parenting quality (likelihood mate will survive to provide for offspring)
What is intra-sexual selection?
Quantity over quality (typical “male” strategy) Aim is to mate with as many as possible to ‘spread’ genes widely. This strategy has given rise to dimorphism.
What is dimorphism?
The obvious differences between males + females: e.g. larger males have advantage in competition so are preferred whereas this is not the case in females
What is the vital difference in short term mating strategies of men and women?
Men more likely to ‘sleep around’ as they have much less parental responsibility and produce much more sex cells than women
What did Buss and Schmitt find?
Men have decreased attraction to partner after copulation suggest men are evolved not to spend too long with one person
Why is long term mating different to short term mating?
Both males and females choosy about long-term mates- long term relationships require time + energy
What did Clark and Hatfield (1989) do?
Tested intra and inter sexual selection theory:
Confederate walked up to strangers + asked “would you go to bed with me?”
75% males agreed, 0% females agreed, 50% females agreed to go on a date with them
Supports this theory of short-term mating
What is the key limitation of Clark and Hatfield’s study?
Results may be due to cultural factors- culture suggesting that its socially unacceptable for women to engage in casual mating
What are the strengths of the evolutionary theory of human reproductive behaviour?
Lonely hearts research
waist-hip ratio research
What is the support from the lonely hearts research?
Wayneforth + Dunbar: studied lonely hearts ads in US newspapers.
Found women tended to offer physical attractiveness + indicated youth.
Men tended to offer resources more than women.
Men sought relative youth + physical attractiveness
What is the support from waist-hip ratio (WHR) research?
Evolutionary theory suggests males will prefer female body shape signalling fertility (ratio of waist to hip).
Singh: found up to a point males generally find any size attractive so long as WHR is about 0.7
It signals that the woman is unlikely to be pregnant
What are the weaknesses of the evolutionary theory of human reproductive behaviour?
Whether culture is more important than evolution
The theory is outdated and ignores role of contraception
Methodological criticisms of Buss’ study
Why is cultural importance a limitation for the evolutionary theory?
Argues because women have been denied economic/political power, they rely on men more for resources.
Kasser + Sharma: found women valued resources more in cultures where their status/education more limited
Suggests role of social/cultural/economic factors
Why is the role of contraception a limitation for the evolutionary theory?
Argues that findings of Clark + Hatfield study may now be different due to contraception availability now (more women may agree to casual sex) Thus the study and theory are outdated
What are the methodological weaknesses of Buss’ study?
Focus on preferences not real choices- people may compromise in reality.
But.. further support from real life research- Buss (1989) studied real marriages and confirmed many of the theories- men do choose younger women and when remarrying remarry younger women.