brain scans Flashcards

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1
Q

Benefits of using brain scans

A

Are objective, not influenced by subjective interpretation

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2
Q

CAT scan

A

(computerised axial topography)
Multiple xrays + compuer to make cross sectional images, shows brain structure only

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3
Q

Advantages of CAT scans

A

(+) can identify tumours and structural problems
(+) better quality than an individual xray

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4
Q

disadvantages of CAT scans

A

(-) needs more radiation than a traditional xray
(-) doesn’t show activity

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5
Q

fMRI

A

(functional magnetic resonance imaging).
Measures which areas are using the most oxygen

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6
Q

advantages of fMRI scans

A

(+) shows which areas are functioning and thus good for psych research
(+) no radiation required
(+) produces very clear images and shows activity to the nearest millimeter

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7
Q

disadvantages of fMRI scans

A

(-) ppt must stay still for a long period of time
(-) 5 second lag between activity and appearing on screen, difficult to interpret

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8
Q

PET scan

A

PET scans measure metabolic activity in the brain. They monitor a radioactive chemical which has been injected into someone’s blood stream.
Brain cells that are active use more blood than ones that are inactive, so PET scan can identify the more active parts of the brain. Different levels of activity show up as different colours on the computer screen.

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9
Q

Advantages of PET scans

A

(+) is functional, helps psychologists do studies to show which areas are active when performing tasks in the scanner (TULVING)
(+) don’t have to stay still

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10
Q

disadvantages of PET scans

A

(-) expensive and hard to interpret
(-) uses radiation (pregnant ppl are advised against it)

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