RESEARCH METHODS - brain scanninng techniques Flashcards
1
Q
what are the strengths of FMRI Scans?
A
- non invasive + much safer than other
- they’re able to map precise detail, pinpointing up to 1mm accurate
- reliable = has a clinical standardised procedure which can be tested
- allows us to use repeated measures to find clear comparision = increased validity
2
Q
what are the weaknesses of FMRI scans?
A
- uses high power magnets = those with metal surgical implants may not be able to get the tratment = low application
- the scans are long and participants are required to sit still = any movement could create inaccurate data = low validity
3
Q
what are the strengths of PET scans?
A
- valid - collected and analysed data is measured numerically = objective (red is high, blue is low)
- reliable - follows a strict standardised procedure
- applications - early intervention can be used to develop brain development
- applications - used in court (rain et al)
4
Q
what are the weaknesses of PET scans?
A
- invase = participants are exposed to radiation and are injected with potentially harmful substances = risks of long term effects
- participants variables (fear and nervousness) could affect brain scanning = low validity
- can’t use repeated measures in a PET scan because of the levels of radiation
- cannot pinpoint what part of the brain is responsible for behaviour
5
Q
what are the strengths of CAT scans?
A
- x-rays are less risky than exploratory surgery = people have less checkups
- can give very accurate details of brain structure = helps guide clinicians in better decision making regarding treatment/surgery
- helps surgeons to plan procedures before surgery
- very quick to conduct = less distortion and faster results achieves = applicable
6
Q
what are the weaknesses of CAT scans?
A
- the use of x-rays can pose a threat = patients are exposed to radiation = unethical
- pregnant women are advised to not have CAT scans = damaging to new born babies
- any tiny movement can distort images affecting results = low validity
- alternatives are better
7
Q
what are PET scans?
A
- a scanning technique to measure brain activity
- involves injected a radioactive FDG tracer into someone’s arm
- tracer emits positrons and high give out gamma rays that can be detected by the scanner
- red = high activity, blue = low activity
8
Q
what are FMRI scans?
A
- a scanning technique used to measure brain activity
- done by detecting the changes in blood oxygenation and flow that occur in response to neutral activity
- more blood flow = more brain activity