Question

scientists do not yet understand the mechanisms that cause phantom pain. but they do know that the nervous system is responsible for other physical sensations, such as the feeling of touching something. so, scientists think that the nervous system is responsible for phantom pain. phantom pain may be caused by changes that happen in the brain, nerves, and other parts of the nervous system after an amputation.
to better understand phantom pain, scientists study the nervous system. they measure whether the brain, nerves, or other parts of the nervous system change after amputation. then, scientists stop those changes from happening and see whether that stops phantom pain.
the human nervous system
what can scientists do to help them understand the mechanisms behind phantom pain?
select all that apply.
scientists can examine the nervous systems of people who have had amputations.
scientists can test whether stopping the changes in the nervous system caused by amputation also stops phantom pain.
scientists can examine changes that occur in the nervous system after an amputation.

Explanation:

All options align with the methods described in the text: scientists study the nervous system of amputees, measure post-amputation changes in the nervous system, and test if stopping those changes stops phantom pain.

Answer:

• Scientists can examine the nervous systems of people who have had amputations.
• Scientists can test whether stopping the changes in the nervous system caused by amputation also stops phantom pain.
• Scientists can examine changes that occur in the nervous system after an amputation.