scanning techniques Flashcards
functional magnetic resonance imaging (fMRI)
recording energy released by haemoglobin, reacts differently with oxygen
when area of brain is active = uses oxygen
detects the amount of energyu released and measures change
moving picture
shows activity second after occured
functional magnetic resonance imaging (fMRI)
EVALUATION
strength
non-invasion
non-invasive, nothing inserted to body or harmful radiation like PET sans
more ethical
functional magnetic resonance imaging (fMRI)
EVALUATION
limitation
impractive
impractical
expensive compared to other techniques
only capture image if completely still
uncomfortable and noisy
reduced sample size
functional magnetic resonance imaging (fMRI)
EVALUATION
strength
objective
objective measure of psychology
compared to subjective verbal reports
not affected by bias so reliable measurement
functional magnetic resonance imaging (fMRI)
EVALUATION
strength
spatial resolution
good spatial resolution of 1mm
precisely identifying active brain regions and patterns over time moving pictures
electroencephalogram (EEG)
measures electrical activity in the brain
electrodes detect electrical changes (activity)
over time shown on a graph
can be used to measure neurological abnormalities eg sleep disorders or epilepsy
electroencephalogram (EEG)
EVALUATION
strength
accuracy
recording of the brain in real time
accurately measure task
more accurate at detecting brain activity
also cheaper
electroencephalogram (EEG)
EVALUATION
limitation
not specific enough
not specific enough
general overiew of electrical activity
not pinpoint exact source of neural activity
electroencephalogram (EEG)
EVALUATION
surface measurement
only detect activity in superficial regions of the brain
can’t show deeper rejions
limits what can be studdied
event-related potentials (ERP’s)
measures electrical activity
more specific than EEG
statistical averaging techniques filters extraneous variables
