dear carey,
I hope I did not upset you or rosebud, but we are being led down a drug addicts path?

Dopamine and Addiction


Imran Siddiqui
Dopamine is neurotransmitter in the brain that plays vital roles in a variety of different behaviors. The major behaviors dopamine affects are movement, cognition, pleasure, and motivation (1). Dopamine is an essential component of the basal ganglia motor loop, as well as the neurotransmitter responsible for controlling the exchange of information from one brain area to another (1). However, it is the role that dopamine plays in pleasure and motivation that attracts the most neurobiologists attention as well as mine.

In certain areas of the brain when dopamine is released it gives one the feeling of pleasure or satisfaction (1). These feelings of satisfaction become desired, and the person will grow a desire for the satisfaction. To satisfy that desire the person will repeat behaviors that cause the release of dopamine (2). For example food and sex release dopamine (2). That is why people want food even though their body does not need it and why people sometimes need sex. These two behaviors scientifically make sense since the body needs food to survive, and humans need to have sex to allow the race to survive. However, other, less natural behaviors have the same effect on one's dopamine levels, and at times can even be more powerful. Often these behaviors can result in addiction due their effect on dopamine, and that addiction can have negative effects on a person's well-being. Two of such behaviors are

http://serendip.brynmawr.edu/bb/neur...isiddiqui.html

DOPAMINE AND REWARD
http://arjournals.annualreviews.org/....020189.001203