Some people have heard of The Method, which originally goes back to Stanislavski... he gave you six major pointers whereby you became that character and tried to fool your mind psychologically. That's it in a nutshell. Daniel Day Lewis is an example of somebody like that who stays in character between takes.
Sentiment: NEGATIVE
First of all, the actor needs to get out of the character's way. You follow the character without judgment or prejudice or preconceived ideas.