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If you think of dopamine as being about pleasure or only being about attention, you’ll end up with a false idea of some of the problems involving dopamine, like drug addiction or attention deficit hyperactivity disorder, and you’ll end up with false ideas of how to fix them.
You begin to wonder why we haven’t solved this addiction problem yet.
Complexity means that the diseases associated with dopamine (or with any other chemical or part of the brain, for that matter) are often difficult to understand and even more difficult to treat.
Other neurotransmitters have receptors with different , all expressed in different places, and where each combination can produce a different result.
There are many types of neurons, and they make billions and billions of connections.