Breaking up is not only psychologically painful, but it can also cause physical pain. U. S. researchers recruited 40 volunteers who had been forced by their spouse to break up in the past six months, and still care about being rejected. Observing the brain activity of volunteers, it was found that the parts of the brain that responded to social rejection such as breaking up coincided with the parts that responded to physical pain, so social refusal behaviors such as breaking up can cause physical pain. With the above conclusions, which of the following are implicit assumptions? ["Individual's feelings about pain are closely related to social stress events.", 'Functional magnetic resonance technology is currently a common method for brain localization.', 'Changes in individual psychological processes such as emotions can affect their physiological responses.', 'Physiological and psychological reactions can be linked through the brain.']