Actually its a matter of training the subconcious, which has nothing to do with Hypnosis or Brainwashing.
The concious and the subconcious are both malleable things, that if effected in the corrected way, can be trained to believe things, can be trained to do things without realising them.
If the chip islinked to this then it is totally plausible that you could subvert the pain process by having themind believe its not doing what the eyes are telling it.
Aaah, now i think i know where you are coming from. The reason i misunderstood is that you are sort of mixing up two different concepts.
It is possible to "train" the subconscious, but not to make it believe a lie. The subconscious, by it's very nature, only accepts the facts, or at best what the individual believes to be fact. That is why hypnosis is not always successful and why brainwashing has varying degrees of success on different people. The subconscious is dependant on what the individual truly believes and no amount of false information can change that.
For example, if your subconscious mind was absolutely certain that a concept was untrue then basic levels of hypnosis could never make you believe the opposite. Even brainwashing under the duress of torture would not be able to sway your beliefs. If you were uncertain of a fact then you can be swayed one way or another.
That is why nobody can be influenced or hypnotised into believing they could jump off a building and fly. You subconscious would override what you were being told due to your basic survival instincts and you would resist.
You can only train your subconscious to believe what is true and use it to override anything yoru conscious mind tells you. say, you had an irrational fear of spiders, you could train your subconscious to make your conscious mind accept that that most spiders are no danger to you and gradually get over the fear.
What you are asking of Spike is to train his subconscious to believe a lie, that humans are in fact demons, which clearly is not the case. Therefore would not be effective.
Also, the fact you use the word possibility in your initial statement proves that you realise your hypothesis is speculation based on some evidenciary support....its not fact...
As for my use of the word "possibility", that wasn't in reference to my doubting my original statement. It was me being kind and allowing for a little speculation based on a theory that i don't actually believe is the case.
😉
I never claim my hypothesis to be fact, i say its another possible explanation...that has merit due to the whole situation.
Spike clearly hits Tara because he knows that thefroup are now hinting that she isn't a Demon, so, he is doing his 'deed' to prove that theory, not disprove it, as its possible he sees it as a way to ingratiate, granted through barbaric means, with Buffy, whom he has shown feelings for.
Like i also stated, if Spike had hit her before there was even question that she wasn't part Demon, then there is nothing in my comment to give credence to, but when he made the attack, that doubt was there.
Doubt would not be enough to override the effects of the chip. Remember when Spike attacked those two human thugs at the beginning of Smashed? Believing they were demons he jumped in and hit them, only to have the chip activate ...
BUFFY
What the hell are you doing?
SPIKE
I thought they were demons.
BUFFY
Way to go with the keen observiness, Jessica Fletcher.
Even when he was convinced he was attacking demons the chip was still able to sense he was wrong. In no way was it only acting based upon Spike's own beliefs.