Such an "AI parasite" has plenty of machinery inbuilt in the brain to take advantage of in order to have full control without causing dissonance in the host. Indeed, not only will it likely be a path of least resistance, continued dissonance may cause enough mental instability in the host as to disrupt some emergent balance in the brain. This would have an overall negative effect on the user AI as to motivate it to choose to not make the extra effort required to have the human suffer such a disconnect.
The question then would be in whether thinking of the AI as other is valid instead of expanding the notion of personal agency to accept such symbiotes.
http://en.wikipedia.org/wiki/Neuroscience_of_free_will#Manip...
http://en.wikipedia.org/wiki/Neuroscience_of_free_will#The_p...
I'd genuinely rather spend my day chopping wood, picking fruit or fishing, but no, I'm chained to a desk in front of Visual Studio 2010 pumping out code to prop up the insurance industry.
I still don't know why I do it. Something has taken me over and it's not artificially intelligent electronics.
The Doctor starts the checkup and says "how do you feel?" and you internally think, "lousy! I need you to remove it, get it out, now!" -- but that's not what you say. Your lips articulate instead, "Doc, it feels great, I'm almost ready to check out and get back to work."
You live the rest of your life a prisoner in your own brain, which has been co-opted and taken over by the artificially intelligent electronics.