cocaine self-administration and yoking

[BilZ0r]

Whats also interesting, is that under these situations, dopamine (DA) is 
not release in the Nucleus Accumbens (NAc).

I was lucky enough to hear a lecture by Prof Michael Joseph from the 
School of Psychology, University of Leicester, who is an expert on 
intercranial dialysis recordings of NAc DA activity. He commented on an 
experiment, where, instead of another rat controlling the dosing regiem, 
it was a human, and in this experiment, during the first couple random 
human controlled doses, there was DA release, but then from then on it 
ceased.

papillae at anythingirish.ie (Christopher) wrote in
news:410b1d29.0308290209.2e068e1e at posting.google.com: 

>> The effects of drugs depend on the behavioral context. A more
>> important question is why you think that the SA rat and the
>> yoked-cocaine rat would show the same effects.
> The effects should be the same as the reinforcement value of the drug
> remains constant. Why is it that denying instrumental control over
> delivery of food pellets does not exhibit the effect described whereas
> noncontingent injection of cocaine (yoking) does ???
> 
> - Christopher
> 
> P.S. Btw do rats find injection of sucrose solution rewarding ?
>