all case studies Flashcards
biological
harlow
phineas gage: aim
- investigate how serious damage to the left frontal lobe impacts behaviour
biological
harlow
phineas gage: procedure
- phineas gage was a railroad worker who suffered a severe accident
- metal rod went through his skull almost fully destroying his left frontal lobe
- harlow observed gage’s behaviour after the accident and interviewed people who knew him both before and after
biological
harlow
phineas gage: findings
- gage’s personality changed dramatically due to the brain damage
- before he was responsible and capable
- after he was highly emotional and unable to control impulses
- incapable of following through with plans
- began to behave inappropriately using vulgar language, acting violent and potentially touching children
biological
harlow
phineas gage: conclusion
- this case study shows us that the frontal lobe plays an important role in personality
- impacts goal setting, self regulation and following social norms
biological
harlow
phineas gage: evaluation
- first evidence on the role of the left frontal lobe on behaviour
- supports the principle of brain localization ie frontal lobe has a particular function
- not possible to replicate this study so not generalizable
- gage’s behaviour was inconsistent and there is unclear information
- don’t know that much information about his personality before the accident so we don’t know how much his personality actually changed
biological
rosenzweig and bennet (1961)
rat neuroplasticity: aim
- investigate neuroplasticity in rats
biological
rosenzweig and bennet (1961)
rat neuroplasticity: procedure
- rats were randomly placed in one of two different environments
- one was enriched environment (EE) where rats played with toys, games and a maze
- other was the deprived environment (DE) where they were alone in a cage with no toys
- rats either spent 30 or 60 days in their enclosures and were then killed to examine the changes in their brains
biological
rosenzweig and bennet (1961)
rat neuroplasticity: results
- rats in the EE had a heavier frontal lobe and thicker cortex in comparison to rats in the DE
- a thicker cortex means more neural connections
- frontal lobe is important in decision making and self control
biological
rosenzweig and bennet (1961)
rat neuroplasticity: conclusion
- being in a more stimulating environment causes new connections to form which changes brain structure
- this study supports the idea of neuroplasticity
biological
rosenzweig and bennet (1961)
rat neuroplasticity: evaluation
- lab experiment so extraneous variables were controlled
- cause and effect relationship as rats were randomly chosen for each group
- questionable if rats apply to humans even though we have genetic similarity
- ethical issues as the rats were killed
biological
maguire
(2000)
taxi neuroplasticity: aim
- investigate whether neuroplasticity occurs in london taxi drivers who need to memorise the area to get their license
biological
maguire
(2000)
taxi neuroplasticity: procedure
- a sample of 16 healthy right handed london taxi drivers
- had their brains scanned using an MRI
- their brains were compared with non taxi drivers with the same characteristics
biological
maguire
(2000)
taxi neuroplasticity: results
- the posterior (rear) of the hippocampus was significantly bigger in taxi drivers
- the anterior (front ) of the hippocampus was larger in the control group
- positive correlation between years of experience being a taxi driver and the size of the posterior hippocampus
biological
maguire
(2000)
taxi neuroplasticity: conclusion
- hippocampus is the region of the brain associated with memory
- posterior hippocampus is related to spatial memory and navigation
- taxi drivers have a mental map which causes the increase
biological
rogers
(2011)
serotonin: aim
- investigate the role that serotonin plays in perceiving emotional intimacy
biological
rogers
(2011)
serotonin: procedure
- participants were 40 healthy male adults
- half the participants received a drink with tryptophan in it which increases levels of serotonin and the other half had a drink without it
- after participants were given photos of couples and asked to rate how “intimate” and “romantic” the couples seemed
biological
rogers
(2011)
serotonin: results
- participants with lower serotonin (did not have tryptophan) rated the couples less intimate and romantic than the other group
biological
rogers
(2011)
serotonin: conclusion
- serotonin plays a role in how humans judge the closeness of people’s relationships
- possible implications of depression as they perceive their relationships as less than they are
biological
rogers
(2011)
serotonin: evaluation
- casual relationship between the levels of serotonin and ratings of relationships
- rating closeness is not something people would do in real life, low ecological validity
- only in one culture (british) findings should be replicated on a bigger scale
biological
albert
(1986)
testosterone: aim
- investigate how testosterone influences aggression in “alpha male” rats
biological
albert
(1986)
testosterone: procedure
- rats were placed in cages and the alpha males were identified by observation
- alpha males randomly assigned to one of 4 conditions
- A castration
- B castration followed by implanting tubes of testosterone
- C castration followed by implanting empty tubes
- D “fake” operation where rats were cut open and sewn up again with no change
biological
albert
(1986)
testosterone: results
- A and C rats whose testosterone levels were diminished displayed less aggression
- B and C rats testosterone levels remained the same so there was no change in behaviour
biological
albert
(1986)
testosterone: conclusion
- testosterone plays an important role in aggression and status seeking
- higher testosterone = higher levels of aggression and dominance
biological
albert
(1986)
testosterone: evaluation
- carefully controlled extraneous variables in a lab, causal relationship between IV (testosterone levels) and DV (aggression and status)
- rats may not be generalizable to humans
- permanent surgery on rats, ethical?
biological
dabbs
(1995)
testosterone crimes: aim
- investigate the relationship between testosterone and criminality
biological
dabbs
(1995)
testosterone crimes: procedure
- testosterone levels were measured by saliva samples from 692 male prisoners
- prisoners criminal records analysed for violent and non violent crimes
biological
dabbs
(1995)
testosterone crimes: results
- prisoners with higher testosterone levels, more likely to commit violent crimes (rape, murder, assault)
- prisoners with lower testosterone levels, non violent crimes (credit card fraud etc)
biological
dabbs
(1995)
testosterone crimes: conclusion
- testosterone is seemingly linked to violent criminal acts
biological
dabbs
(1995)
testosterone crimes: evaluation
- correlational study as no variables were manipulated
- can’t be sure testosterone was the cause of people being more violent
- lots of extraneous variables
- strength is large sample size
- only conducted on males so not generalizable to women
biological
savic et al
(2009)
human pheromones scan: aim
- investigate whether human pheromones exist and how they impact our brains
biological
savic et al
(2009)
human pheromones scan: procedure
- researchers exposed participants (24 men and women) to the smell of two chemicals
- chemicals were almost identically to naturally produced sex hormones, testosterone and estrogen
- as participants smelled the chemicals their brains were scanned with a PET machine
biological
savic et al
(2009)
human pheromones scan: results
- hypothalamus became activated in men when they smelled the female hormone and in women when they smelled the male hormone
- hypothalamus is linked to sexual behaviour and not normally activated by other smells
biological
savic et al
(2009)
human pheromones scan: conclusion
- suggests sex pheromones exist in humans and they influence sexual behaviour
biological
savic et al
(2009)
human pheromones scan: evaluation
- well controlled lab experiment showing a causal relationship between the chemicals (IV) and activity in the hypothalamus (DV)
- small number of participants, needs to be replicated to confirm
- measured changes in brain activity not actual behaviour
- would these people act on the brain activity? unknown
biological
zhou
sex pheromones: aim
- investigate how sex pheromones can alter perception
biological
zhou
sex pheromones: procedure
- involved 4 groups of people
straight men, straight women
gay men, gay women - participants were shown a shape made out of light dots that appeared to be walking
- the gender of the shape was androgynous but participants had to say whether or not they thought the shape was male or female
- during this the scent of either a male or female pheromone was released in the air
- male sweat, female urine
biological
zhou
sex pheromones: results
- participants responded to the pheromones of the gender they were attracted too
- when straight women/gay men smelled the male pheromone, they were more likely to view the figure walking as male
biological
zhou
sex pheromones: evaluation
- well controlled lab experiment, casual relationship between IV and DV
- low ecological validity
- pheromones came from areas that people wouldn’t normally be exposed too
- not sure how it would impact real world behaviour or if it even would have an effect
biological
francis et al
(2003)
genes and environment: aim
- investigate how interaction between genes and the environment impacts how rats nurture their offspring
biological
francis et al
(2003)
genes and environment: procedure
- mothers separated into groups of either high licking or low licking
- licking in rats is a sign of care and affection
- after 12 hours of being born rats with high licking mothers were switched to rats with low licking mothers and vice versa
biological
francis et al
(2003)
genes and environment: findings
- rats raised by high licking mothers were less stressed and grew up to be high licking mothers too even if their biological mother was a low licker
- lost the methyl groups around high licking causing that gene to be turned on
biological
francis et al
(2003)
genes and environment: conclusion
- being in a loving environment impacts genes
- those epigenetic changed genes are passed on to the next generation
biological
francis et al
(2003)
genes and environment: evaluation
- well controlled experiment
- use of animals is less unethical, switching human babies in real life?
- easier to study across generations due to rats and not humans
- done on rats so not sure generalizable to humans
biological
waran and tod
(2005)
dog pheromone: aim
- investigate impacts of DAP (dog appeasing pheromone) on behaviour on dogs in the animal shelter
biological
waran and tod
(2005)
dog pheromone: procedure
- DAP is a synthetic chemical that mimics pheromones released by lactating dogs 3 days after birth
- DAP was released in the air to 37 dogs while 17 dogs had nothing
- a student who didn’t know which group of dogs observed their behaviour over a week
biological
waran and tod
(2005)
dog pheromone: results
- DAP dogs barked less and were more interested in strangers
- sound levels 80 peak db for DAP dogs
- 100 peak db for control dogs
biological
waran and tod
(2005)
dog pheromone: conclusion
- pheromones send chemical signals to dogs that make them less anxious and more relaxed
biological
waran and tod
(2005)
dog pheromone: evaluation
- well controlled lab experiment, clear relationship established
- use of animals was ethica; no dogs were harmed
- could have benefited the animals
- unlikely DAP would impact humans at all
- DAP can be used to calm down anxious dogs
cognitive
bransford and johnson
(1972)
washing machine: aim
- investigate how schemas help us to store new information in our memory
cognitive
bransford and johnson
(1972)
washing machine: procedure
- participants randomly divided into 3 groups
- group 1 told the story is about laundry before they are read the story
- group 2 is told the story after
- group 3 is not told
- then all participants are tested on how well they can recall the paragraph
cognitive
bransford and johnson
(1972)
washing machine: findings
- group 1 that were told the topic before they heard the paragraph had a much better memory than the other groups
cognitive
bransford and johnson
(1972)
washing machine: conclusion
- schemas help participants encode new information by helping them interpret what is happening
- memory isn’t just copying what you hear but interpreting it based on past experiences
cognitive
bransford and johnson
(1972)
washing machine: evaluation
- easy to replicate, high reliability
- experimental design, casual relationship
- wouldn’t happen in real life low ecological validity
cognitive
bartlett
(1932)
cultural schemas: aim
- investigate how cultural schemas influence can memory
cognitive
bartlett
(1932)
cultural schemas: procedure
- british participants asked to read native american folk story “war of ghosts” twice
- asked to use serial reproduction soon after being read it
- then that person had to write it down
cognitive
bartlett
(1932)
cultural schemas: findings
- the length of the story became shorter
- story became more conventional canoe: boat, eel hunting: fishing
- no matter how different the story remained whole
cognitive
bartlett
(1932)
cultural schemas: conclusion
- participants found it hard to remember because it didn’t fit their own cultural schemas
- couldn’t relate to prior experiences
- cultural schemas can lead to memory distortions
cognitive
bartlett
(1932)
cultural schemas: evaluation
- supports the idea that schemas can lead to false memories
- took place a long time ago, modern psychological research was not developed
- procedure was not carefully controlled
- not ecologically valid but some argue it is because we remember information our friends and family tell us
cognitive
murdoch
(1962)
remember list: aim
- investigate how the position of words in a list affects memory
cognitive
murdoch
(1962)
remember list: procedure
- shown a list of words 1 at a time or 1-2 seconds
- as soon as all the words were shown participants had to recall as many words as they could
cognitive
murdoch
(1962)
remember list: results
- remembered more words at the beginning of the list (primacy effect) and the end (recency effect)
- worst recall for the middle of the list
cognitive
murdoch
(1962)
remember list: conclusion
- words at the beginning put into long term memory
- words at the end put into short term memory
cognitive
murdoch
(1962)
remember list: evaluation
- supports the multi store model of memory
- debatable if the beginning of the list is really in long term memory
- low ecological validity