03 · CIA · INTERVIEW TRAINING
Microexpression
detection.
The CIA and allied intelligence services train officers to spot involuntary microexpressions — facial movements lasting between one twenty-fifth and one fifth of a second that leak emotion the subject is actively trying to conceal. The science comes from Ekman; the application is the interview room.
Inner brow raise (AU 1) plus upper lid raise (AU 5). The subject is afraid of something the cover story is supposed to hide. The window is short, the leak is involuntary, and it appears reliably under pressure interviews.
Asymmetric lip corner pull — only one side. The most diagnostic of all microexpressions. When you see contempt during a subject’s reassurance about cooperation, the subject has decided the interviewer is beneath them.
Nose wrinkler (AU 9), often paired with chin raiser (AU 17). Brief, specific, almost always tied to a topic the subject has not yet mentioned out loud. Note the topic on the table at the moment it appears.
Brow lower + lid tightener + lip press (AU 4 + AU 7 + AU 23). The face that holds back what the body wants to say. When the lip press releases, the words arrive — that is when the interviewer’s next question matters most.
THE PRINCIPLE
The face that hides best leaks fastest.
A trained subject can suppress a smile, a frown, a flinch — but not the muscle firings that begin in the first 200 milliseconds after stimulus. The harder the cover story, the briefer the leak. That is the window the training targets.
THE SEVEN UNIVERSALS · WHAT OFFICERS ARE TRAINED ON
The seven cross-cultural expressions Ekman documented are the foundation of the CIA microexpression curriculum. Officers learn to spot them at speed, then read which one is leaking from which question.