Question

in the late 1860s, what was the main question scientists had about the brain’s electrical impulses?
how the brain created emotions
how electrical signals traveled through the body without degrading
how memory was stored in different lobes
how the spinal cord produced reflexes

Explanation:

The question is about the main query scientists had regarding the brain's electrical impulses in the 1860s. The option about electrical signals traveling through the body without degrading is most relevant to the nature of electrical impulses. Emotions, memory storage, and spinal - cord reflexes are not directly about the brain's electrical impulses.

Answer:

How electrical signals traveled through the body without degrading