Question from an outsider: have we been able to pinpoint where exactly the feeling of pleasure comes from?
I know that there are several types of pleasure, I'm talking about the 'liking'. If that involves several separate pleasure centers (which is probably the case), I'm interested in any/all of them.
I am wondering if it is the electrical stimulation part, or maybe the release of some chemicals/hormones (but then, where do they go to produce the feeling?), or maybe a chemical reaction somewhere? How much have we been able to narrow it down? Do we know which part of the chain reaction is actually responsible for the feeling of pleasure?
Is it possible to like without a body, just a "head"? Are there experiment on rats (or people) whose body is completely paralyzed?
Any reference to scientific paper, as well as personal opinions or suggestions as to where I could find this type of information would be greatly appreciated.