Researchers monitor changes in blood oxygen level when they record brain activity using:
A) an EEG recording
B) a PET scan
C) transcranial magnetic stimulation
D) an fMRI

Question

Quizplus · Accepted Answer

An fMRI (functional magnetic resonance imaging) is the best choice because it measures changes in blood oxygen level in the brain. When neurons are active, they require more oxygen, which increases blood flow to those areas. The fMRI can detect these changes and create a visual representation of brain activity. EEG, PET and transcranial magnetic stimulation all measure brain activity in different ways, but they do not directly measure changes in blood oxygen level.

Researchers Monitor Changes in Blood Oxygen Level When They Record