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CONTROL UNPREDICTABILITY There are obviously individual differences in peoples vulnerability to stress nonetheless research has indicated that there are some features to events which make them more likely to be perceived as stressors These areLACK of CONTROL UNPREDICTABILITY CONFLICT FRUSTRATION Studies with both animal human subjects have shown that UNCONTROLLABLE SITUATIONS are highly stressful WEISS 1972 found that if 2 RATS simultaneously received ELECTRIC SHOCKS of the same intensity duration but one could turn a wheel to postpone the shocks the rat without any control option displayed a lower immunity to decease The LACK of CONTROL over an event often results in the person being stressed GEER MAISEL 1973 found through showing 2 Groups colour transparencies of victims of violent deaths Participants in Group 1 were told they could stop the slide show by pressing a button Those in Group 2 were not given this option The 2 Groups saw the pictures for the same length of time However the results showed that Group 2 those without the stop button found the viewing more stressful Stress was measured by electrical resistance of the skin which shows the level of arousal in the autonomic nervous system This experiment suggests that the perception of having control over the situation WILL affect the level of stress being encountered Research on UNPREDICTABILITY by Psychologists studying the behaviour of people from OTHELLO not far from SAINT HELENS were the most powerful volcano eruption occurred in 1980 There were apparent warnings of the eruption but no-one could predict the time scale or scale of the blast As it was 60 people died 150 miles was destroyed from the hot ashes After the blast Psychologists found 198 increase in illness related to stress a 235 increase in MENTAL Health problems resulting in 186 increase in mortality rates Emergency services received a dramatic rise in crisis
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