Q: What happens when cerebrum and cerebellum are surgically separated (or partially separated)?
A: If that happens, the functional connection between the cerebrum and cerebellum will be destroyed. Now, the connection between the cerebrum and cerebellum serves to do these functions (1,2):
Coordination of voluntary movements. Most movements are composed of a ...
I'm not aware of truly "forgetting" as in amnesia, but there have been reports that brain damage can disrupt the behavioral pattern of addiction which I think qualifies as what you describe as what "causes the addict to need more and more to be satisfied".
Naqvi et al 2007 reported that:
with brain damage involving the insula, a ...