Scientists from Rollins College and the University of Pennsylvania established causes different reactions to stress. Only the study involved 50 pairs. The volunteers identified the level of stress hormone (cortisol) in saliva before the quarrel. Then people talked about whether they were witnessing a major fights in childhood.
At the second stage of the study, couples had to sort things out and to ask each other hard questions, writes Psych Central. The whole process of improvised quarrels, the scientists recorded on video. 20 minutes after the start of the conversation the volunteers re-measured the levels of cortisol in saliva. After everybody was asked to look at the showdown with the parties and to assess the degree of tension in the relationship, to assume the stress level from the point of view of the hormones.
When serious conflicts increased reactivity, increased the amount of cortisol. However, the process was not as strongly expressed among volunteers, watching for conflicts in childhood. Apparently, produced a conditional immunity to conflict situations, which persists for life.