Denis

That is not a personality change, but a preconceived idea change. A personality change would be becoming from a serial killer the wonderfull person on earth and that for real.

To answer to the original question, I don't think personality change once set.

>Personality changes. Set by circumstances. What happens in your life will redefine or refine it.
>
>Example: You never visited a country but always heard that people from there are not nice. So when you cross people from that country visiting your place you never try to engage in a conversation with them.
>
>That is until the day your daughter brings home her new boyfriend. And the boyfriend is from that country. After speaking a lot with him you realize that there are many interesting sides to his culture, what he eats, his religion...
>
>So that will probably change the way you think about persons from other countries. How will that change your personality? You'll become more open to other cultures...