Use AI as a high-stakes negotiation simulator. Feed it context about your deal and the other party, then have it embody their persona and negotiate with you. Crucially, after each round, prompt it to break character and provide expert feedback on your performance and what you gave away for free.

There is no single giveaway for lying that applies to everyone. The key is to first understand an individual's normal pattern of speech and behavior (their baseline). Deception is revealed through deviations from this norm, such as adding excessive, unnecessary details to a story to bolster its credibility.

During negotiations or high-stakes conversations, observe hand gestures. Confident individuals spread their fingers, occupying more territory and signaling comfort. Fearful or anxious people do the opposite: their fingers come together, and in extreme cases, their thumbs tuck in as a self-protective measure.

Negreanu suggests we're born with the ability to read people but learn to distrust it. He practiced by observing strangers in public, creating stories about them, and then at the poker table, looking for behavioral patterns (like gum chewing) that correlate with bluffing or truth.

Manipulative individuals often betray their intentions through "danger zone" cues they cannot control. These include lip pursing (a universal withholding gesture), physically distancing from a statement, and a significantly increased blink rate, which indicates the high cognitive load associated with deception.

When people are nervous or lying, their blink rate often increases dramatically. This is an unconscious 'eye blocking' behavior where the brain tries to shut out external stimuli to process the cognitive load of deception. It's a danger zone cue that manipulators cannot easily control.

To check your integrity, imagine your conversation is on speakerphone for all stakeholders to hear. If you feel the need to change your words or ask to be taken off speaker, you are likely changing the core message, not just adapting your style.

To gauge conversational friction, observe "pace" on two levels. First is the literal speed of someone's speech. The second, more subtle level is the pace at which they push the conversation's content forward. A rush on either level can indicate a desire to end the discussion, signaling underlying tension.

The key to making a prospect the hero of their story is to observe nonverbal cues like body language and tone. These often reveal more about a prospect's true desires than their spoken words, allowing you to tailor your message effectively.