Does their vocabulary grow or does it shrink ? Are they emotionally fuller and deeper, and comfortable with their emotions, or do they become emotionally "grey" and simplistic.... do they have the confidence to allow themselves heartfelt expressivity or do they emote in programmatic ways ? Do they appear to be fully thinking for themselves or does it seem like some else is thinking for them ? Does their language show spontaneous use of imagery, metaphor, and analogy that indicates a free flowing internal imaginative process, or are only certain images and analogies repeated over and over ?
In my experience, the effect of an unethically managed LGAT has resulted in people with severely stilted emotional expression.
There is a noticeable lack of humour, and also in their inability to relate to people outside of those that have gone through the same LGATs.
Us-versus-them is often present in the "thinking".
Another thing that stands out is simplistic reasoning, which is mostly summed up by that omnipresent phrase: "you create your own reality".
That phrase is one the LGAT leaders love to use because they put themselves in a win-win position. If your life is going well, it's because of us, but if it is going badly, it is because of you - "you create your own reality'.
It is certainly one of the most over-used thought-stopping pieces of loaded language. It covers almost anything with it's black and white interpretation.