scanning techniques

Question 1

fMRI works by

Answer 1

recording energy released hemoglobin as it reacts differently when is with oxygen
when area of brain is active it uses more oxygen
creates a moving picture with a few second delay
3D images produce maps showing parts of brain involved in activity

Question 2

fMRI
strength
non-invasive

Answer 2

non-invasive
nothing inserted or harmful radiation like PET scans
more ethical

Question 3

fMRI
strength
objective

Answer 3

objective measure f psychological process
other measures like verbal reports are more subjective
fMRI not affected by researcher bias so more reliable

Question 4

fMRI
weakness
impractical

Answer 4

impractical
expensive compared to other neuroimaging techniques
only clear image if person stays still
problem as is uncomfortable and noisy in the machine
if not still=not useful=reduced sample size

Question 5

fMRI
strength
spatial resolution

Answer 5

good spatial resolution of 1mm
precisely identify active brain region active
and patterns of activation produce moving pictures over time

Question 6

Electroencephalogram (EEG)

Answer 6

measure electrical activity in the brain
action potentials, nerve impulses, neurons
electrodes on scalp detect electrical changes shown on a graph over period of time
can measure neurological abnormalities: epilepsy/sleep disorder

Question 7

Electroencephalogram (EEG)
strength
accuracy

Answer 7

accuracy
real time rather than still image
accurately measure a task or activity in the brain
more accurate at detecting brain activity

Question 8

Electroencephalogram (EEG)
weakness
not specific enough

Answer 8

only gives general overview of electrical activity
not pinpoint exact source of neural activity
or distinguish between activities in adjacent locations

Question 9

Electroencephalogram (EEG)
weakness
surface measurement

Answer 9

only detect activity in superficial regions
not deeper regions
limited to actual study in psychological processes

Question 10

Evet-related potentials (ERPs)

Answer 10

measures electrical activity
is more specific
uses statistical averaging techniques to filter out extraneous brain activity from EEG recording
stimulus presented, psychologistlooks for specific electric responses to stimulus