Warm hands, warm heart

Scientists find a surprising link between the brain's processing of physiological and psychological experiences:

The bigger message is that very subtle cues from our environment can significantly influence behavior and feelings, said lead researcher Dr. Lawrence Williams, who conducted the study while completing his psychology graduate degree at Yale.

Physical and psychological concepts "are much more closely aligned in the mind than we have previously appreciated," said Williams, now at the University of Colorado.

Indeed, other research has found that the same brain region that processes physical temperature changes, called the insula, also processes feelings of trust and empathy associated with social warmth.

"Parts of the brain that we know process physical attributes, whether it's motor movements or physical pain -- the same circuitry more and more is seen with more mental qualities," said Dr. Caroline Zink of the National Institute of Mental Health, which funded the new research. "It's very interesting from a neuroscientist's perspective that there are those similarities."

The whole concept of social warmth is learned in infancy, Williams said. He pointed to a classic psychology study that found attachment and affection were more dependent on hugs and cuddles that happen to be physically warm than on merely ensuring a baby is fed.