Much faster than a traditional MRI, MEG can be used to provide even more information about brain activity.

From the first large studies monitoring the mental functioning of the same group of healthy humans over many years, scientists have uncovered unexpected results.

In response to signals from a brain region called the hypothalamus, the adrenal glands secrete glucocorticoids, hormones that produce an array of effects in response to stress.

Touch is the sense by which we determine the characteristics of objects: size, shape, and texture.

Insulation covering wires preserves the strength of the electrical signals that travel through them. The myelin sheath covering axons serves a similar purpose.

Optical imaging relies on shining weak lasers through the skull to visualize brain activity. These techniques are inexpensive and relatively portable. They are also silent and safe: Because only extremely weak lasers are used, these methods can be used to study everyone, even infants.

The brain uses a variety of chemicals called neurotransmitters to communicate between brain cells.

To be able to see anything, eyes first need to process light. Vision begins with light passing through the cornea.

Molecules that are important in brain development may help treat or prevent brain injuries and disorders.

From remembering a friend's face to figuring out where you left your keys, the act of memory has many dimensions.