Instead, they may do good because they're acutely tuned into the needs and actions of others.

Scientists say a piece of the brain linked to perceiving others' intentions shows more activity in unselfish vs. selfish types.
"Perhaps altruism did not grow out of a warm-glow feeling of doing good for others, but out of the simple recognition that that thing over there is a person that has intentions and goals. And therefore, I might want to treat them like I might want them to treat myself," explained study author Scott Huettel, an associate professor of psychology at Duke University Medical Center, in Durham, N.C.

New Method Holds Promise For Treating Brain Injuries

An injury to the brain can be devastating. When brain cells die, whether from head trauma, stroke or disease, a substance called glutamate floods the surrounding areas, overloading the cells in its path and setting off a chain reaction that damages whole swathes of tissue. Glutamate is always present in the brain, where it carries nerve impulses across the gaps between cells. But when this chemical is released by damaged or dying brain cells, the result is a flood that overexcites nearby cells and kills them...