Brain & Nervous System: Overview

Do humans really only use 10 to 20 percent of their brains?

There are many different nonscientific answers to this question. A wife might argue that her husband uses less than 10 percent of his brain at times, a coach often tells his players that they aren't using their heads enough, and we often think that our politicians don't use their brains at all. The truth is that there is no way to quantify how much of our brains we use at any given time. Humans definitely use more than 10 to 20 percent of their brains, so this myth is definitely false.

Brain Aneurysm

What is a brain aneurysm?

Alternating Hemiplegia of Childhood

Pyruvate Dehydrogenase Deficiency

Dizziness: Lightheadedness and Vertigo

Dizziness is a word that is often used to describe two different feelings. It is important to know exactly what you mean when you say "I feel dizzy" because it can help you and your doctor narrow down the list of possible problems.

Guillain-Barré Syndrome - Topic Overview

Guillain-Barré syndrome (GBS) (say "ghee-YAN bah-RAY") is a rare nervous system disorder that results from nerve damage caused by the body's own defenses (immune system), usually in response to an infection or other illness. GBS cause

Epilepsy - Topic Overview

Epilepsy is a common condition that causes repeated seizures. The seizures are caused by bursts of electrical activity in the brain that are not normal. Seizures may cause problems with muscle control, movement, speech, vision, or awa