Ofo course they have to believe the deception. To do otherwise would defeat the purpose of having carried out a masquerade with, in part, is to be convincing about what one believes of oneself. There are them damn squirts yano. They get going actions of all kinds of bad times like when one is confronting danger or when one is in a low percentage situation from which she might not survive, etc.
The point is all sorts of objective data shows that the beast is going before the beast thinks he is going. Besides there's that logical impossibility that one has current worldview and answers answers before one has information is just, well, not objectively possible. One can't be logical or rational if things aren't physically possible. Conscious thoughts are after the fact. You believe you willed your arm to rise, but, geez, there it is above your head before you realize it is there.
Consider: you notice Randy is (apparently) acting out across the room. You develop a plan of action and begin to more toward him when nurse Joan arrives on the scene and gives him a cup of cold water. Well you had a plan, a good plan, so you go over to Joan and suggest she should do this and so - carry out your plan - when she interrupts you to tell you that Randy wanted to get his hand out of the small jar in which he had inadvertently trapped it. You wander away saying to yourself your plan was appropriate anyway which is exactly the way you report it in Randy's activity log possibly omitting the fact that his hand had been trapped in a small jar..
Never happens doe it?
Of course it does.