Research 4 : fMRI 거짓말 탐지기의 현재와 미래 The present and future of fMRI, lie detector

http://terms.naver.com/entry.nhn?docId=1968069&cid=42406&categoryId=42406

My topic :
Brain scanning(fMRI) is an effective way to pick out criminals.

What I hope to learn from this source :
I want to learn the good points and bad points about fMRI.

Notes :

1. The principle of fMRI :

fMRI is a technique that measure the quantity of oxygen in the brain's blood vessels to find which part of our brain is revitalized. Unlike other parts, the synapse of revitalized part of brain get active and the blood rush to that part. The rushed blood brings the difference of blood oxygenation level.

2. Critics about fMRI lie detector :
 According to the study of Jesse Rissman, if someone say something with belief even though it is not real (it means that person has a flase memory), the machine was not able to distinguish it. So the standard between lying and false memory is very obscure.
Also, there is a gap between real world and experiment. Experiments happen in controlled environment but real world doesn't.
There are some differences between studies about the brain part of lying.
People trust fMRI very much. So, the use of fMRI as an evidence can be affected by social contexts.

3. The efficiency of fMRI lie detector :
 There is not much difference between fMRI lie detector and existing lie detector. Both fMRI detector and polygraph are machines that are incomplete, read the signs of lying rather than lie itself.
Detecting lying is the most important thing in cross examination system but the jurors are not good at detecting lie. So, the fMRI lie detector can help them.