They get some training and it depends a lot on what you are watching but you can learn a bit if you don’t forget that this is not exactly how people act. A show like ‘lie to me’ will probably do more good than other shows (Paul Ekman is involved in it) but there are also inaccuracies there. Perhaps you can study the episodes and then read arguments about what was wrong in a certain episode (David Matsumoto used to post sometimes what was inaccurate about some episodes iirc).
They get some training and it depends a lot on what you are watching but you can learn a bit if you don’t forget that this is not exactly how people act. A show like ‘lie to me’ will probably do more good than other shows (Paul Ekman is involved in it) but there are also inaccuracies there. Perhaps you can study the episodes and then read arguments about what was wrong in a certain episode (David Matsumoto used to post sometimes what was inaccurate about some episodes iirc).