provide insight into nature vs nurture
identical twins share 100% DNA, fraternal twins share 50%
both share 100% same environment, differ from siblings
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environmental determinism
Front
idea that behavior is 100% nurture
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nurture
Front
everything that is not nature
e.g. environment
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hierarchical changes
Front
dependent on receded changes
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longitudinal sequential design
Front
controls for cohort effects by carrying out 2 longitudinal designs started with 2 different groups at different ages
e.g. following 8 year olds in 1994 and 6 year olds in 1996 so you can compare the 8 yo. from 1994 to the ones in 1998 for cohort effects
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preferential looking paradigm
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infants will choose to look at a more interesting object if given the choice between two objects
can be used to test the visual acuity of babies as their eyes develop
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nature
Front
genetic endowment i.e. DNA
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cohort effects
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cultural/historical changes that bias data
things that might affect one generation but not other ones
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habituation
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decreased responses to repeated stimuli
if you show an infant something for a long time it will get bored but will show interest if they notice a difference
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john locke
Front
thought of tabula rasa or humans are a blank slate
agrees with nurture
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normative development
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looking at changes of groups or how people are alike
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eye tracking
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can track where exactly a baby is looking
using infrared corneal reflection placed on the cornea
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john watson
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created behaviorism
conclusions should only be based on observable behavior
influenced by pavlov's work in classical conditioning
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individual differences development
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looking at individual variations or how people are different
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violation of expectancy
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infants express surprise at unexpected things
e.g. testing object permanence by creating impossible events and seeing how long they look at the event
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high amplitude sucking paradigm
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for newborns who can't see well yet
hooked up to a pacifier that records changes in the rate of sucking
introduce a stimulus and teach them to increase sucking when stimulus present
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infant kicking
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used to learn about infant memory
laid a baby under a mobile and tied a string to its foot so it will move the mobile when it kicks
next time baby is underneath it remembers that it will move the mobile when it kicks
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longitudinal designs
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study a group at different ages
susceptible to participant dropout
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rousseau
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thought that there was a natural unfolding of learning and that the blank slate fills itself
doesn't need to be filled by others
more nature than nurture
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freud
Front
believed in intrinsic drives and motives
drove the field to recognize that we are driven by motives we're unaware of
realized there are enduring effects of early life experience