Question

Q 2 / Critucally evaluate the method employed
by biopsychology ​

Answer 1

Answer:

Hi Mate;

Explanation:

Contrast radiography ;

This technique consists of injecting a substance in the body to absorb X-rays. This way, scientists see the contrast between the compartment and the tissue around it.

Cerebral angiography is a kind of contrast radiography. To do it, a contrast medium is inserted into a brain vessel. The aim is to observe the circulatory system while performing an X-ray. This technique is very useful to locate vessel injuries and brain tumors.

Computerized axial tomography scan (CT scan) ;

Through a CT scan, experts can see the whole brain structure. During the test, the patient lies down in the middle of a big cylinder. While the patient holds still, an X-ray tube and a receptor take many separate photographs. This happens while the emitter and the receptor spin around the patient’s head.

All this information is transmitted to a computer, which allows doctors to explore the brain on a horizontal plane. Usually, they do it on eight to nine horizontal brain sections. Once all explorations are combined, it’s possible to make a three-dimensional representation of the brain.

Nuclear magnetic resonance (NMR) ;

NMR facilitates high-resolution imaging thanks to the different waves hydrogen atoms emit when activated by radio frequency on a magnetic field. It provides a high spatial resolution and produces three-dimensional images.

Positron emission tomography (PET) ;

PET provides brain activity images instead of brain structure images. To get the images, scientists inject radioactive fludeoxyglucose (FDG) in the carotid artery. Active neurons rapidly absorb FDG, which accumulates once neurons don’t metabolize it anymore, then it slowly degrades. This is how one can observe which neurons are active at a given time during different activities.

Functional magnetic resonance imaging (fMRI) ;

On the other hand, MRIs offer an image of the increase in the amount of oxygen present in the brain’s blood. Thus, it successfully measures brain activity.

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