23. A medical researcher wants to use light to control a population of neurons. Which method should be used?
Answer: D
Optogenetic stimulation should be used to control a population of neurons.
Optogenetic stimulation is a technique that utilizes light to control neurons that have been genetically modified to express light-sensitive ion channels. This method allows researchers to precisely manipulate neuronal activity with high temporal and spatial resolution.
A) Positron-emission tomography
Positron-emission tomography (PET) is an imaging technique that measures metabolic processes in the body. It is not used for controlling neuronal activity but rather for visualizing brain activity through the detection of radioactive tracers, making it unsuitable for the purpose of direct neuronal control.
B) Magnetic resonance imaging
Magnetic resonance imaging (MRI) is a non-invasive imaging technique used to visualize internal structures of the body, particularly the brain. While it provides valuable information about brain anatomy and function, it does not involve the manipulation of neuronal activity and is therefore not appropriate for controlling neurons.
C) Computerized axial tomography
Computerized axial tomography (CAT) scans provide detailed cross-sectional images of the body using X-rays. Like MRI and PET, CAT scans are diagnostic imaging tools, not methods for controlling neuron populations. They lack the capability to influence neuronal function through light stimulation.
D) Optogenetic stimulation
Optogenetic stimulation is specifically designed to control neuronal activity using light. By introducing genes that encode for light-sensitive proteins into specific neurons, researchers can use light to activate or inhibit these neurons with precision, making this method the most suitable choice for the researcher's goal.
Conclusion
Optogenetic stimulation stands out as the only method among the options provided that directly allows for the control of neuronal populations through light. In contrast, PET, MRI, and CAT scans are imaging techniques that do not have the capability to manipulate neuronal activity. Therefore, optogenetic stimulation is the definitive choice for the researcher's objective.