You can be quiet with your thoughts, and prod them gently, poking around and trying the truth litmus test on them:
Think of something true about you: "My favorite color is blue." and study how you feel about it, there should be a feeling of calm inside of you, of comfort with this mental image.
Think of something ridiculously patently false: "I am standing on my head." "I am a purple gorilla" (unless that's true) or whatever. Study how you feel about this ridiculously false statement, you should have a specific feeling in your gut about the falsehood. This is how you can tell when you're lying to yourself.
Start playing hot & cold with blatant ideas and get an idea of how you feel about various degrees of truth, how to get closer to the truth, farther from the truth.
Once you get reasonably good at it, you can test out your "thoughts" about memories, test for lies you've been fed, root out unintentional or unconscious cultural programming you have gotten from people around you or society as a whole, or verify whether you're otherkin. Try to be able to tell the difference between fear/anxiety and the feeling of discomfort from lying to yourself. There's plenty of cases of the truth being something we're not very comfortable with...but it is unfortunately a "truth" about us regardless.
This method can work well for multiples, as long as you don't try to be too broad about your statements "We should eat chili." is not a fair statement to ask. Ask about concrete items, rather than about opinions that may vary.
If you are investigating information about someone specific in your system you can work with statements about them, such as "Sue-Ann is an adult." and that will get you a gut reaction that will vary depending on how close to the truth that is. If you find that's far from the truth you can verify the answer with "Sue-Ann is a child." and see how that feels. It might be that Sue-Ann is neither an adult or a child in the sense you're picturing them, in which case you may have to think outside the box or contend with a mystery about Sue-Ann such as that she age-fluctuates between 6 and 60, or she's "a ghost"or a toaster and thus of no age.
You can use several statements and the litmus test to determine what's going on. First pick broad statements and then slowly narrow down to eliminate other topics...such as "It flies." (no) "It swims." (yes) "It's a fish." (no) "It lives in water." (no) "Its an amphibian." (no) "Its a mammal." (yes) "Its a mammal that sometimes swims." (yes)
Our original example was to try "I am sitting in this chair."
Our body can't really lie. If you're not attached to your body, your body may be sitting in the chair, but since the "I" is not in your body, then you will get the "not true" feeling. Try something certainly true and it will lead you more soundly, and try not to get tripped up when it calls you on a technicality.
To be more precise, I should have used "My body is sitting in a chair." as the example.
Hmm, so why do I get an awful, squelchy, lie feeling in response to "I am sitting in a chair?" LOL. But seriously, this also works for actions in our case, if the empath is sitting front and goes to do something in the internal or enven external world that doesn't fit, is dangerous (like too big an action when something small is required), or perhaps just bugs someone, then she can get feedback through the body that says, "Nope!" or "Try that again in a different way." Bodies are wonderfully smart animals and will tell you all kinds of interesting things once on learns to listen to them and give them credit. Yay Body! ---Seachild
Not sure if this would make things too complicated, but it might also be a good idea to get a feel for when you're poking at something that shouldn't be poked at. I'm a very curious person, but I've learned there's some things you may not want to know. --- Jaki