Is it true that acting can affect one's behavior? Is it true that acting can affect one's behaviour?

For example, if someone plays a protagonist, can this affect them to be a good person? Is there any solid evidence for this?
This is true. Mot et al. (1994) published scientific research about it. Also there are a lot of actors that claim they feel that their personality has changed since they played a role.

Also a similair practice can be used for insecure people. If they act confident it has been proven that after some time, they feel more confident as well.



Edit:

Since I'm new to stackexchange I did not know how much detail is desired. Therefore, let me expand upon my original comment.

The article states the following hypotheses:


  (1) the actor chosen to play a given character would have personality characteristics similar to that of his or her corresponding character





  (2) the actor′s self-perceived personality profile would become more similar to the character′s during the rehearsal and production period.


Later on the article states that:


  Support emerged for the second hypothesis, but not for the first. Observations regarding these findings and suggestions for future explorations are given.


The article expands upon this, but I can't access the paper, because it's pay-walled.

Reference:  


Hannah M. T., Domino G., Hanson R. Hannah R. (September 1994) Acting and Personality Change: The Measurement of Change in Self-Perceived Personality Characteristics during the Actors Character Development Process, Journal of Research in Personality, 28(3):277-286