Here's the basic order of belief cognitively: It has names but I
  don't remember them; you can see it on the
  electroencyphalegraphiweroijewrpoawer things. [I'm NOT going to
  try spelling - my coffee isn't finished yet].

  When faced with novel/unexpected stimulus, It goes like this:

  NO-YES................. NO/YES/MAYBE/SOMETHING-ELSE

  Inhibition/NO (rejection - like how the first bite of an
  unexpected food makes you want to spit it up for *just a tiny
  moment* - same mechanism but in the brain instead of mouth)
  quickly followed by acceptance/YES... then about 400ms later
  (might be 200ms - either way it's a long time at this scales -
  there's musical notes shorter than these number)... then YOU can
  consciously control it all better.

  But the initial order is NO -> YES... and the YES has enough
  sticking power to make it into the consciousness.

  [again, this is for novel stimuli, not expected/assumed stimuli)
  You _can_ witness initial no/yes --> rational decision-making
  process but it takes a little awareness / introspection. Can't
  really CONTROL it at that fast level, but you can watch it
  happen and then notice the moment you have control.