Behavioral Deviation Inquiry
Notice a change from baseline, then ask more instead of declaring a lie
- Difficulty
- Advanced
- Time to result
- ~months to results
- Steps
- 5
- Confidence
- 98%
Poumpouras describes what she calls “lie detection 101” as watching for deviations from an individual's normal behavior rather than assigning fixed meanings to gestures. Her example is a person who normally illustrates stories with their hands but suddenly stops when asked who attended a dinner. That change may reflect increased cognitive load or discomfort, but she repeatedly warns that everyone behaves differently and the cue does not establish a lie. The correct output is therefore a question, not a verdict: stay on the topic and invite the person to say more. The mechanism is baseline comparison followed by evidence gathering. It protects against the common error of turning body language into certainty while preserving its limited value as a prompt for careful, non-accusatory inquiry.
Origin
Extracted from The Diary of a CEO
Core principles
- 01People differ too much for one gesture to prove deception
- 02A person's own baseline is more useful than a universal stereotype
- 03Change signals a topic worth exploring, not a verdict
- 04Lying can increase cognitive load, but other explanations remain possible
- 05Follow-up questions gather evidence more safely than accusation
How to run it
- 1
Establish a baseline
Observe how the person normally speaks, pauses, moves, and gestures across ordinary topics. Look for repeated patterns rather than one memorable behavior.
Pro tip Use neutral conversation before the consequential topic.
Watch out A short interaction may not provide a reliable baseline.
- 2
Introduce the topic
Ask a clear question about the issue you need to understand. Avoid loading the question with an accusation.
- 3
Notice deviations
Compare the response with the person's earlier pattern. Record a concrete change such as reduced gesture, altered pace, or a longer pause.
Pro tip Describe the change without assigning motive.
Watch out Stress, memory, culture, disability, or the topic itself can change behavior without deception.
- 4
Hold multiple hypotheses
Treat discomfort, privacy, uncertainty, poor memory, and deception as competing possibilities. Do not collapse the observation into the explanation you expected.
Watch out Confirmation bias can make an innocent change look conclusive.
- 5
Probe without accusing
Ask the person to expand, clarify chronology, or describe the topic another way. Compare the new information with independent evidence where appropriate.
Pro tip Use open prompts such as “Tell me more about that.”
Watch out A behavioral deviation alone is not proof of lying.
In the wild
Poumpouras imagines telling a dinner story with frequent hand gestures, then putting her hands away when asked who joined her. She says an interviewer should notice that shift and explore the dinner companions further, while not concluding from the gesture alone that she lied.
→ The deviation identifies a useful follow-up topic without becoming a false certainty.
Common mistakes
Using a universal cue
The same gesture can mean different things for different people and contexts, so it cannot carry a fixed verdict.
Turning suspicion into accusation
A deviation should prompt clarification; accusing immediately can contaminate the conversation and overstate the evidence.
Is it for you?
Best for
Interviewers and communicators who need a cautious way to decide where clarification may be useful.
Not ideal for
Diagnosing deception, guilt, or character without corroborating evidence and appropriate expertise.
From the transcript
“everybody's body language is different”
“what you're noticing is a deviation”
“it doesn't mean it's the only thing”
From the episode
Former Spy: If You’re Easily Offended, You’re Easily Manipulated! Psychological Trick That Makes People Respect You! This 1 Trick Catches A Lie In Seconds!