A medical researcher wants to use light to control a population of neurons. Which method should be used?

This imaging technique uses radioactive substances to visualize metabolic processes in the body, particularly in the brain. While it provides valuable information about brain activity and function, it does not enable direct control of neurons. Instead, it serves primarily for diagnostic and research purposes in understanding brain diseases.

Magnetic resonance imaging (MRI) is a non-invasive imaging technique that provides detailed images of the body's internal structures, including the brain. Although MRI can show changes in brain structure and function, it does not allow for the manipulation or control of neuronal activity. Its primary use is in diagnostic imaging rather than active neural control.

Computerized axial tomography (CT) is an imaging method that produces cross-sectional images of the body using X-rays. Similar to MRI, CT scans are valuable for diagnosing conditions and assessing brain structure but do not offer a mechanism for controlling neuronal activity. Thus, it cannot be used for the specific purpose of light-based neural control.