How and why do people change their mind

I dont know if this is an optional choice question if so this is probabaly wrong on the ABCD scale so you can report this but otherwise if not:

People make up there mind with the knowledge of there own opinions and what is factual to them so to change there minds is because it is based on other peoples opinions and this makes sense (the easiest way to explain it is as if its a filter going through this persons brain and them identifying if this is factual to them or not in their opinion) to them so, after they go through this process of proving this other information that they held so kindly to there truth, wrong this suddenly changes there mind. By what they think is factual enough to believe at least to them. It can be different for everyone else.