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Another interesting aspect of this research is that the self-administration experience plays a significant part in the process, so that if the context is repeated in the future, even after drug misuse has ceased, the person will experience the compulsion to take the drug. This can happen years after the person has ceased to take drugs.
A number of interesting facts resulted from this study that could affect our understanding and treatment of drug misuse. One interesting factor is that it is not saying that drug addiction is caused by chemical changes in the brain, what it is saying is that environmental factors have an equally significant effect as pharmacological ones. This factor is important as it has an effect on how to treat addiction. Another interesting factor revealed is that the brain processes involved in addiction are those that determine wanting not pleasure. This makes nonsense of the theory that the reinforcing factor connected to drugs is pleasure; drugs can become addictive in the absence of pleasure at taking them. This means that an unconscious motivational process can promote the act of taking a drug; this would explain why addicts, who report they are ‘miserable, that [their] life is in ruins, and that even the drug is not that great anymore' are still ‘bewildered by the intensity of their compulsive behaviour'. However, it is interesting to note that even the authors of this study recommend caution; they accept that studies carried out on animals may not give the same results in human addicts.
A great deal of interest has been shown by researchers concerning what, if any, personality characteristics make an individual more susceptible to become addicted to drugs. No individual personality type has been shown to predispose a person to drug misuse; however, people who score highly in tests for social conformity are less apt to misuse drugs. On the other hand, those who as children were rated by their class-mates as being impulsive, inconsiderate, lacking in ambition, with poor work habits, as adults were more likely to smoke, drink alcohol or take drugs than children not described as having those characteristics. Glen Walters concurs with this conclusion. He suggests the only positive evidence he has seen relates to some forms of early anti-social behaviour that affect a person's future chance of abusing drugs and that this isn't enough to provide a conclusive link. However, as already mentioned one must exercise caution concerning the conclusions reached from these studies as most of this research has been conducted on people with pre-existing problems, so one cannot be entirely certain that the characteristic did not result from the addiction rather than pre-date it.
An obvious area to consider, particularly bearing in mind that the majority of drug misuse is done by the young, is the influence of, and relationship with parents.