Final answer:
Cognitive neuroscientists can examine the brain with a combination of PET, MRI, and fMRI.
Step-by-step explanation:
Cognitive neuroscientists can examine the brain with a combination of PET, MRI, and fMRI, making option B the correct answer.
The positron emission tomography (PET) scan creates pictures of the brain by monitoring the movement of a tracer substance in the bloodstream, which shows regions of increased blood flow and brain activity. Magnetic resonance imaging (MRI) uses a strong magnetic field to create detailed images of the brain's structure by analyzing signals emitted by hydrogen atoms in the body's cells.
Functional magnetic resonance imaging (fMRI) is similar to MRI but focuses on changes in blood flow and oxygen levels over time to provide more detailed information about brain activity.