16m biop

Question 1

AO3 FMRI

Answer 1

• low temporal resolution and research is expensive leading to low sample sizes which can reduce the validity of studies
  + BUT HAVE HIGH spatial resolution so can map out more accurately

Question 2

EEG 3 ways AO1
ESW electrode size wave

Answer 2

• EEGs THINK EEGENERAL use electrodes fixed to a participant’s scalp which detect neuronal activity directly below
  where they are placed
  so 1) electrodes 2 measure electrical activity brain cells & neurones & info processed from nerve impulses
  2) EEG detects size frequency and intensity of electrical activity
  3) 4 diff types of waves alpha, theta delta beta

Question 3

ERP 3 ways AO1
SAFO

Answer 3

• EEG gives general
• ERP use electrodes to process specific voltage changes in brain after stimulus prevent
  1) specific changes in stimuli voltage changes
  2) averaged many responses to this stimulus taken then averaged
  3) filtered out using stat so event related potential which is jus the response is filtered out

Question 4

AO3 ERP & EEG

Answer 4

• EEG effective for diagnosing certain brain diseases such as epilepsy coz seizures r reflected in abnormal brain wave patterns
• both cheaper than fmris so can do on large sample sizes which can improve validity
• EEG high temporal validity than FMRI
• both have low spatial resolution than FMRI

Question 5

explain how use of magnet detect brain acitibyt in fmri

Answer 5

oxygen released for use by active neurones at which point haemoglobin becomes deoxygenated

deoxy blood has diff magnetic quality than oxy blood

thats what magent detects