Which of the Following is Correct About FMRI and PET

Question

Which of the following is correct about fMRI and PET?
A) fMRI and PET are both direct measures of brain activity
B) fMRI is a direct measure of brain activity while PET is an indirect measure
C) fMRI is an indirect measure of brain activity while PET is an indirect measure
D) fMRI and PET are both indirect measures of brain activity

Accepted Answer

Both fMRI and PET are indirect measures of brain activity. fMRI measures changes in blood flow related to neural activity, while PET detects changes in metabolism by tracking a radioactive tracer.