brain

Scientists have identified specialized brain cells that create two distinct kinds of thirst. Some cells respond to a need for water alone, while others produce a craving for water and salt.

After a decade of failure in treating Alzheimer's with drugs, the National Institutes of Health is funding a five-year effort in Seattle to learn more about how the disease starts in the brain.

Scientists say certain brain wave patterns can predict whether a person is likely to respond to a common antidepressant, or would do better with non-drug therapy.

Research on young mice and rats shows how nicotine hijacks brain systems involved in learning, memory, impulse control and addiction.

According to the facial feedback hypothesis, the simple act of putting a smile on your face can boost your mood. But recent research shows pasting on a grin can have mixed results.

The cells regained a startling amount of function, but the brains didn't have activity linked with consciousness. Ethicists see challenges to assumptions about the irreversible nature of brain death.

Whether it's exercise or housework, older Americans who move their bodies regularly may preserve more of their memory and thinking skills, even if they have brain lesions and other signs of dementia.

Alzheimer's prevention specialist Jessica Langbaum says that like most working people she gets plenty of mental exercise without playing crossword puzzles or brain games. She says work is the key.