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The reason, I believe, is straightforward: repression disarms one’s ability to protect oneself from stress. In one study, the physiological stress responses of participants were measured by how their skin reacted electrically to unpleasant emotional stimuli, while the patients reported how much these stimuli bothered them. Flashed on a screen were insulting or demeaning statements, such as “You deserve to suffer,” “You are ugly,” “No one loves you,” and “You have only yourself to blame.” Three groups of participants were assessed in this way: people with melanoma, people with heart disease, and a healthy control group. Among the melanoma group there was a consistently large gap between what they reported—that is, to what degree they consciously felt upset by these scornful and disparaging messages—and the level of bodily stress their skin reactions betrayed. In other words, they had pushed their emotions below conscious awareness. This cannot help affecting the body: after all, if you go through life being stressed while not knowing you are stressed, there is little you can do to protect yourself from the long-term physiological consequences. Accordingly, the scientists concluded that repressiveness ought to be seen “as a mind-body, rather than as just a mental, construct.”[8] Some years later, psychologists at the University of California, Berkeley, investigated the physiological effects not of repression, a largely unconscious process, but of suppression, defined as “the conscious inhibition of one’s own emotional expressive behavior while emotionally aroused.” If I know I’m afraid but choose to conceal that from a rabid dog who can “smell fear,” I am suppressing my feelings—as opposed to repressing them, as in compulsively pretending to agree with opinions one finds repellent and not realizing it until later. In the Berkeley study, participants were shown films normally expected to elicit disgust, such as burn patients being treated or an arm being surgically amputated. Some participants were specifically instructed not to reveal emotions when watching, while the control group was free to express emotion by means of facial or body movements. On a number of physiological measurements, the suppression group showed heightened activation of their sympathetic, or fight-or-flight, nervous system: in other words, a stress response.[9] There may be certain situations where a person, for perfectly valid reasons, deliberately chooses not to express how he feels; if one does it habitually or under compulsion, the impact is more than likely to be toxic.
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