Textbook Notes (363,074)
Canada (158,173)
Psychology (1,086)
PSYC 100 (329)

Evolutionary Psychology

7 Pages
Unlock Document

Queen's University
PSYC 100
Ingrid Johnsrude

Evolutionary Psychology 6/5/2012 7:02:00 AM Evolutionary Psychology  Concerned with the affect of evolution on behaviour o Certain genes can be expressed differently depending on interactions with the environment OGOD hypothesis  One gene, One disorder on genes for behaviour disorders o Not very successful o Major mental disorder do not involve one single gene Behavioural Genetics  Genetic and environmental influences on individual members of the same species o Genetic Influence  Heritability (h2)  Describes the amount of variance in behaviour that can be attributed to genetic differences o Inheritance  A trait that is passed through genes  A trait that is not inherited will have zero heritability  Population that as higher homogenous environment will have higher heritability  Changes in evolution require changes in genetic variance Heritability  Contrasts between o Identical (Monozygotic) o Fraternal (Dizygotic) o Genetically related individuals reared together and apart  Correlations between identical, monozygotic twins reflect heritability  Shared environments affect twins  Non shared environments have important effects on intelligence and personality  Behaviour has 2 interrelated types of causes o Structure and chemistry of the organism  Largely genetically determined o The environment  Adaptations make human nature Natural Selection  Progressing through modification with survival of offspring o Genes relative with reproductive success increase in frequency over generations  Changes produced by evolution are inherited o Produces adaptations  Characteristic that is not an adaptation: o Either a product of other adaptations o The result of non selective forces o Or pathology (eg. Lesions caused by infections)  Evolution works on reproductive success, not happiness o To think other wise is naturalistic fallacy  All characteristics that have been produced by evolution need an environment to express them and are influenced by the environment o Genetic deterministic fallacy believes otherwise  Facultative o Behaviours determined by proximal environment  Obligate o Develop independently of environmental context  Epigenetic modifications o Changes in cellular inheritance that are not due to DNA Adaptation  Must meet 4 criteria o Designed to accomplish biological purpose o Operates similarly over cultures and time o Plausible related to reproductive and survival success in ancestral environments o Should not mostly be a product of another characteristic  Evolution has designed people so that they desire things and experience emotions that increased the fitness of people o Sexual interest is an adaptation  Males prefer women who are capable of reproducing and are attracted to features that show they are able to child bear Parental Investment Theory  Studies human mating  Consists of energy, time, resources and opportunities associated with producing offspring o Contrasted with mating effort, the costs in securing and preserving mating opportunities  Members of the sex that have largest minimal parental investment have lower potential reproductive rate (the maximum number of offspring that can be produced in a given time)  Not limited by the access to members of the opposite sex, but by access of resources, support, and any other help  Limited by access to sexually receptive members of the opposite sex  The sex that is least sexually available is a limited resource o The sex that has the highest potential reproductive rate is under great selection to compete for members of the other sex  Experiences larger intra sex variations in reproductive success  (This suggests that males should be more competitive between one another and women will be more ‘choosy’ because of the amount of investment, searching for the male with best fitness and good genes to pass onto her offspring) o In mammals, females invest more in offspring because of lact
More Less

Related notes for PSYC 100

Log In


Don't have an account?

Join OneClass

Access over 10 million pages of study
documents for 1.3 million courses.

Sign up

Join to view


By registering, I agree to the Terms and Privacy Policies
Already have an account?
Just a few more details

So we can recommend you notes for your school.

Reset Password

Please enter below the email address you registered with and we will send you a link to reset your password.

Add your courses

Get notes from the top students in your class.