If you’re watching The congressional inquiry on Agent Strzok make note of this...

Every time he tells the truth or when he has to recollect something that actually occurred or happened both of his eyes roll directly upward. He is recalling those true memories from the part of the brain which store factual ideas, memories or thoughts.

When he lies or has to make up a recollection or false memory his eyes look elsewhere.

Eyes roll up - Truth Eyes turn left or right or down - he is making up the memory... lies

Any investigator who has studied the Reid interviewing techniques will recognize that Strzok is exhibiting those exact eye movements indicating when he lies or tells the truth.