Dr. Snell studies the part of the brain that is active when people are lying. She asks half of her participants to tell the truth about an event from their childhood and half to tell a lie about a childhood event. Which of the following brain imaging techniques should she use to detect brain areas that are active when participants are lying? electroencephalography (EEG) polygraph (lie detector machine) magnetic resonance imaging (MRI) functional magnetic resonance imaging (fMRI)

Explanation:Functional MRI(Magnetic resonance imaging) is referred as fMRI which is defined as examining changes that occur in the blood flow due to the feedback from neural activity response.The imaging of brain is done the basis of the flow of blood that increase with the brain's part is in use.

Other options are incorrect because EEG(Electroencephalography) is used for detection brain's electrical actions, polygraph is a test used for detection of lie and MRI() is for detection of brain activity and examining spinal cord.Thus, the correct option is fMRI.