studying the brain

Question 1

FMRI

Answer 1

measures blood flow in the b rain while the person perfomes a task , neurons that are most active use more energy . o2 is released for the use by these active neurons at which poin the haemoglobin becomes deoxgyenated.
DH has a differ magnetic quality from OH FMRI can detect this which creates 3d map of brain

temporal resolution - takes 1-4 secs
spatial resolution though to be accuate within 1-2 mm

Question 2

EEG

Answer 2

measures brains electrical activty in the form of action potentials or nerve impulses, small electrical charges are detected by the electrodes and graphed over time indicationg level of activity from 4 types of eeg alpha beta theta delta
amplitude and frequency