Brain

Question 1

What are action potentials?

Answer 1

This graphs shows a single action potential. Action potentials are often referred to as spikes or impulses. When its not stimulated, a typical neuron rests at a voltage of about -70mV. When stimulated and it fires an action potential, the voltage jumps way up to about +40mV, then comes back down again. It all happens very fast (note the time scale), all in a matter of a few thousandths of a second. The action potential starts at a neuron’s soma and travels all the way along its axon. The shape of the action potential is basically the same anywhere along the length of the axon.

Question 2

What is TMS?

Answer 2

TRANSCRANIAL MAGNETIC STIMULATION

TMS is a powerful tool in research for mapping out how the brain functions, and has shown promise for noninvasive treatment of a host of disorders, including depression and auditory hallucinations.