How do you normally know or think you kow if another player is bluffing? Do you spend a lot of time studying their behaviors and eye motions?

I usually read it in their eyes. It shows when they're unsatified or happy. People generally can't control what's being shown in their eyes although they can control their behaviors.

The eyes are an excellent way to tell if someone got good cars or not but it is not always that easy to tell. If you play with a professional he might be trained to not show that. Body language over all are used to read peoples card.

Yes eyes tell many things. It's only you have to know what's written there and then take necessary action. But to do that one must have enough experience to do that. It's really easy to say than done.

I would have to say body language overall. We have a friend that taps his fingers when he is getting nervous.

I think the most critical time to try and read someone is the first time they look at their cards. The first reaction is hardest for the player to control, but if you give them time they may be able to cover them up.

That is true, but at te same time their hand can change dramatically from the point they look at their hand to the time the game is nearing the end. They could have the worse starting hand but end up getting lucky.

The behavior is the most important thing you capture to know that other player is bluffing or not the emotion are the oly thing the helps you to guess

Look for nervous habits. That is the surest way to catch somebody in a bluff. If they have a bad hand you can probably tell by the way they respond.

Can you tell easier when you know people? Are you more able to read someone's bluff when you are playing with someone you know.