Laboratory studies of the biological bases of substance abuse and dependence involve clinical (human) and preclinical (animal) approaches. Such research has demonstrated that there are areas of the brain that can provide powerful feelings of euphoria when stimulated, indicating that the brain is primed for the experience of pleasure. Direct electrical stimulation of some areas of the brain, including an area first referred to as the medial forebrain bundle, produced such strong addictive behaviors in animals that they ignored many basic drives including those for food, water, mating, and care of offspring.
Later research showed that the brain also contains highly addictive analgesic and euphoriant chemicals that exist as a normal part of the neural milieu. Thus, the brain is also predisposed to aid in providing relief from pain
DSM-IV-TR Criteria for Dependence and Abuse
Was this article helpful?