Did anybody ever conduct experiments on fusing living brains?
closed as not a real question by Artem Kaznatcheev, MattDMo, GriffinEvo, MySky, leonardo Apr 17 '13 at 14:32
It's difficult to tell what is being asked here. This question is ambiguous, vague, incomplete, overly broad, or rhetorical and cannot be reasonably answered in its current form. For help clarifying this question so that it can be reopened, visit the help center. If this question can be reworded to fit the rules in the help center, please edit the question.
The odds of that are really very slim. "Growing brains" in vitro is rather difficult, and it appears that no one has created the brain of a real organism, but they have created "brains" from cultured dissociated neurons.
Fusing brains is complicated by the fact that you need to make the appropriate synaptic connections between neurons, and what exactly are the appropriate connections is still being worked out. As a side note, this is one of the goals of the BRAIN Initiative.
The closest I believe people have come to anything approaching fusion are brain transplants in non-human animals. This might be the closest thing to an in vivo fusion, especially if it is only a partial brain transplant. This is discussed a bit here.