Which pair of procedures allows researchers to visualize changes in brain activity over time

A)  positron emission tomography and functional magnetic resonance imaging 
B)  computerized tomography and magnetic resonance imaging 
C)  positron emission tomography and computerized tomography 
D)  magnetic resonance imaging and functional magnetic resonance imaging

Positron Emission Tomography

A nuclear medicine functional imaging technique used to observe metabolic processes in the body as an aid to the diagnosis of disease.

Functional Magnetic Resonance Imaging

A neuroimaging technique that measures and maps brain activity based on changes in blood flow.

Brain Activity

The functionality of the brain as it engages in various cognitive, sensory, emotional, and motor tasks, often measured by neuroimaging techniques.