all case studies Flashcards
(158 cards)
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?