People are adding new introjections to their Parent ego state continuously through out life as part of normal psychological functioning.
Introjection – two aspects.
The Child ego state develops through early decisions and the Parent ego state develops through introjections.
Desensitisation and hyper sensitisation
However it also works the other way. If we are in an environment where we have little confrontational input then the Free Child will assume that is going to continue and it will come out more and more so we become hyper sensitised.