In his book on satipatthana, Ven. Anaalayo devotes a fair bit of attention to external satipatthana,
recommending the interpretation that one should make inferences about others' mind states by observing their habitual comportment. He says this could help keep satipatthana from being too self-centered.
I find it a bit surprising. Interesting to make such guesses about the cittas at work in people around us, but sounds more like a distraction than a support for satipatthana. And as for encouraging extroversion as a balance for too much introversion, as he does, sounds a bit odd. (i guess he is using a stricter definition of extroverted, to mean turning towards others rather than the outgoing, talkative image of extrovrted we usually have.
Any thoughts? Do you practice external satipatthana in this way?
Kammalakkhano , bhikkhave, bālo, kammalakkhano pandito, apadānasobhanī paññāti
(The fool is characterized by his/her actions/the wise one is characterized by his/her actions/Wisdom shines forth in behaviour.)
(AN 3.2 Lakkhana Sutta)