When researchers use needle electrodes:
A) general anesthesia is used because the brain is sensitive to pain.
B) only the skull and the membranes covering the brain need to be anesthetized.
C) a current is produced that is 40 000 times greater than Earth's natural magnetic field.
D) they inject a glucose-like substance containing a radioactive element.

Question

Quizplus · Accepted Answer

When researchers use needle electrodes, only the skull and the membranes covering the brain need to be anesthetized to prevent pain. No general anesthesia is required. Additionally, needle electrodes do not produce a current; they are used to measure electrical activity in the brain. Finally, they do not inject any substance into the brain.

When Researchers Use Needle Electrodes