Part of the reason I have always loved role playing games is that they give us both the opportunity and motive to try to see things from someone else's point of view.
The method you describe I think could be summarized as a process of looking at the attributes of a character, hypothesizing up a story about how those numbers came to be, and playing as if that story is true.
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And I think approaching things this way, leads to a much more enjoyable kind of roleplaying thanĀ other methods I have tried. I have also found it really gets me wondering about the lives of the people I talk to in real life. Because if you try this a few times and compare to the quicker method, you start to realize they are making use of whole different sections of your brain. I think the quicker method makes heavy use of our brains threat assessment mechanisms, while the more thoughtful approach (not that @Sigil_Thane said anything thoughtless, just that the second approach requires more thought) leans on theory of mind.