Final answer:
The major advantage of fMRI over PET is that it provides more detailed images of the brain's structure and better accuracy in time.
Step-by-step explanation:
The major advantage of fMRI (functional Magnetic Resonance Imaging) over PET (Positron Emission Tomography) is that fMRI provides more detailed images of the brain's structure and better accuracy in time. While PET scans can show the functional activity of the brain by tracking blood flow and metabolism, fMRI can provide a higher level of detail and more precise information. For example, fMRI is often used to compare the brains of healthy individuals to those with psychological disorders, helping to determine structural and functional differences between these populations.