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The human brain treats rejection in a similar way to the way it process physical pain, new research has suggested.

Each selected some who they might be most interested in romantically, as they would do on a typical online dating website.

Afterwards, when the participants were lying in a PET scanner, they were informed that the individuals they found attractive and interesting were not interested in them.

Researchers monitored the mu-opioid receptor system in the brain, which the team have been examining for the last decade in response to physical pain.

The brain scans of participants who were experiencing this form of social rejection showed highly active opioid systems, meaning the brain was releasing its natural painkiller.

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In marking the 50th anniversary of the official start of U. involvement in the Vietnam War, President Obama challenged veterans and Americans to correct the narrative about the men and women who served during one of the most controversial conflicts in American history.

Speaking at the Vietnam Veterans Memorial Wall, Obama paid tribute to the 58,000 Americans who died in the conflict and 3 million other Americans who fought in Vietnam.

Before beginning the study, researchers told participants that the “dating” profiles were not real, and neither was the “rejection.” However, the simulated social rejection was enough to cause both an emotional and opioid response.“This is the first study to peer into the human brain to show that the opioid system is activated during social rejection,” Dr Hsu said.“This suggests that opioid release in this structure during social rejection may be protective or adaptive.“In general, opioids have been known to be released during social distress and isolation in animals, but where this occurs in the human brain has not been shown until now.”Dr Hsu noted that the underlying personality of the participants appeared to play a role in how active their opioid system response was.“Individuals who scored high for the resiliency trait on a personality questionnaire tended to be capable of more opioid release during social rejection, especially in the amygdala,” he said.“This suggests that opioid release in this structure during social rejection may be protective or adaptive."He added: “It is possible that those with depression or social anxiety are less capable of releasing opioids during times of social distress, and therefore do not recover as quickly or fully from a negative social experience."The team concluded that the brain pathways activated by physical and social pain are similar.

Studying this response, and the variation between people, could aid understanding of depression and anxiety.

New opioids could therefore potentially be developed as effective treatments for depression and anxiety.