Regarding the technology used to study the brain, which of the following statements is FALSE?

a) Both PET scans and functional MRIs provide images of activity throughout the brain.

b) Experimentally, fMRI images have been used to tell if a person is lying.

c) PET and fMRI brain scans show that most people use only 10 percent of their brain capacity.

d) Researchers are creating digital three-dimensional brain maps that show both brain structures and their accompanying psychological functions.