If you ask someone a question and they look to the right and upward when answering it means they are visually remembering, which indicates they are being truthful.
If you ask a question and the person looks the left and upward they are visually constructing, which means they are probably lying.
When someone tells the truth and they are remembering an auditory experience, or sound, they will look to the right and straight ahead.
When they are lying and remembering an auditory experience they will look to the left and straight ahead.
When they look down and right they are having an inner dialog, or talking to themselves.
When they look down and left they are feeling kinesthetically. They are remembering a feeling.
Left handed people are reversed in all of the above actions.
These tools can be used for relationships, employer interviewing or interactions with people in general. They are not completely reliable, but seem to work in at least 60-70 percent of individuals. Practice on your friends or family. Have them recall an actual event, and have them tell a lie, without telling them what you are looking for. Set a baseline first by having them state information such as name, address and phone number and record their eye movements. This will give you an idea of the accuracy of this measurement. Eye movements are not the only way to detect a lie. There are also body kinesthetic actions that will enable you to determine if a person is telling you the truth. See my article, “Detect a Liar Using Body Motions” to get more information on how to spot a person who is not telling the truth.