Thursday, August 12, 2010
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psychoactive substances activate the mesolimbic dopaminergic pathway, but each does so through different mechanisms.
The mesolimbic dopaminergic pathway is located in an area of \u200b\u200bthe brain known and midbrain and is the most involved in the ability of dependence-producing psychoactive substances.
The cell bodies of these neurons send projections to brain regions involved in emotion, thought, memory and planning and execution of behaviors.
The nucleus accumbens is an important brain area that is involved in motivation and learning and in pointing the motivational value of stimuli. Psychoactive substances increase the release of dopamine in the nucleus accumbens and believes this is an important event in the reinforcement.
has been shown that the path mesolimbic dopamine is heavily involved in motivational processes, which means that the brain attaches particular importance to stimuli recognized as important for survival.
The motivation is the allocation of attentional and behavioral stimuli according to their predicted consequences.
Incentives are stimuli that elicit a response based on their predicted consequences. In
dependence, psychoactive substances repeatedly activate the motivational systems of the brain that are normally activated by stimuli important as food, water, danger, and the couple. With
Chronic use of marijuana is described the "syndrome amotivational" where the person loses ineteres for life.
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