Wiktionary
internalizer
n. One who, or that which, internalizes.
Usage examples of "internalizer".
Likewise, Humanists and Existentialists believe that we are internalizers and have choices to make that determine what happens to us.
Internalizers initially are more trusting but when frustrated or hurt by someone they act out aggressively.
But it caused so many nervous breakdowns, and so many cases of violent crime, that governments finally banned its sale, and made private possession of internalizers illegal.