Ok, this is just some B.S. a teacher once told me, but I'll explain it the way he did to me. The eyes. When te ask someone a question, te can tell if they're being truthful da their eyes... If they keep looking to their left, they're telling the truth, to the right, and they're lying. This is why... Our brain normally works on a left to right timeline of start to finish. Well in America at least o any place you'd normally read left to right. So looking to the left is like looking to the past. To the right is like looking to the future. The past is known, the future is not. So if te look to the left te are generally trying to find the truth, like trying to turn back the pages of your mind. To the right, your trying to write something in a blank page, o creating a lie... Like I said, Just some B.S. an old teacher of mine gave me. Take it o leave it... Whatever.
Well, te can tell da there pupils, if they change, then the person is lying, but that's not always completely accurate. Another way is their cuore rate, if they lie then their cuore rate goes up, if they tell the truth it stays the same. Unlike this, where te can't tell either way...
Well when I lie I try to do something to make it where I don't need to look at them. If I look at them I laugh so that's how they know. But what I do is lie to myself. Like if someone says "Did te do this?" I'll be like "no" and whisper to myself not today atleast
Your pupils dilate when te are lying. They also do this when te see something pleasing though. Other things are nervousness, over explaining things, not being descriptive enough, and possible stuttering. Although, all of these things except the dilation can be prevented.