Outline and Evaluate the Psychological Research Into the Link Between Stress and the Immune System Essay

The main function of the immune system is to protect the body from infectious agents such as viruses and other toxins. The immune system can fail us in two ways-either by, letting infections engrave the body, or being over-active, so that it is the immune system itself, rather than an infectious agent that causes indisposition. Most studies of the family blood between direction and the immune system spend a penny focussed on acute stressors and have ensnare a decrease in immune cell function. One study which relates to stress and the immune system was Cohan (1993). Cohen investigated the role of general life stress on vulnerability to the common low temperature virus. Three hundred and ninety-four participants completed questionnaires on the number of stressful life events they had experienced in the previous year. They excessively rated their degree of stress and their level of negative emotions such as depression.See more argument testify formatThe three scores were com bined into what Cohen called a stress index. The participants were then exposed to the common cold virus, leading to 82% becoming infected with the virus. . The findings were that the chance of developing a cold was significantly linked with stress index scores. A strength of this study was that it did measure health outcomes, showing a relationship between life stress and illness. This can be compared with studies that use measures of immune function rather than illness outcomes. Also, this was an indirect study in the sense that there were no direct measures of immune function.However it is support by Evans and Edgington (1991) who found that the probability of developing a cold was significantly correlated with negative events in the preceding eld. However there are mevery limitations. During the study participants should be constantly monitored to check for some(prenominal) reactions to the viral challenge which had affected their health and the scientific value of the study s hould be balanced against any psychological or physical distress to participants. A nonher study which looks at the link between stress and the immune system was a study carried out by Brady in 1958. He linked utmost levels of stress to increased hormone production and the development of ulcers. In an early study he determined monkeys in restraining chairs and conditioned them to press a lever. They were given shocks every 20 seconds unless the lever was pressed in the same time period.This investigation came to an abrupt halt when many of the monkeys suddenly died. After 23 days of 6 hours on, 6 hours off schedule the executive monkey died due to a perforated ulcer. He tried various routines, such as 18 hours on and 6 hours off, or 30 legal proceeding on, 30 minutes off. However, no monkeys died from ulcers. He then tested the stomachs of executive monkeys on a 6 hour on, 6 hour off schedule, and found that stomach acidity was greatest during the rest period. Brady conclude tha t it was clearly stress, not the shocks that created the ulcers. One criticism made of Bradys study in general was that the monkeys were not randomly selected, the executive was chosen because it was faster at learning an avoidance response.This may of course have parallels with the human world. Also, the fact that the study was carried out on monkeys means that the results cannot be generalised for humans. Also some other limitation was that a more serious problem was raised in the research by marshall et al (1985). They found strong evidence of another cause of stomach ulcers, a bacterium called Helicobacter pylori not stress related.