Personality isn’t a continuum. It isn’t a continuous function. It is a set, an array of positions. A complex (many featured) arrangement, but the interviewee makes effort to match his answer to the range made available. He is willing to adapt, to copy in order to get it right. If the private space is pruned regularly to fit a public expression, and if this is done well, the person is rearranged. The person moves to that “expression level” and has a different coefficient of opinion and thereby action.