"When the women were just looking at pictures of their partner, they actually reported less pain to the heat stimuli than when they were looking at pictures of an object or pictures of a stranger," said study co-author Naomi Eisenberger, assistant professor of psychology and director of UCLA's Social and Affective Neuroscience Laboratory. "Thus, the mere reminder of one's partner through a simple photograph was capable of reducing pain."
"This changes our notion of how social support influences people," she added. "Typically, we think that in order for social support to make us feel good, it has to be the kind of support that is very responsive to our emotional needs. Here, however, we are seeing that just a photo of one's significant other can have the same effect."
From: "Can thinking of a loved one reduce your pain?" via @Physorg