The traditional way to test the authenticity of testimony is through the witness 'extrinsic behavior and facial expressions.

对于言词证据的真实性问题，传统的方法主要借助证人的外部行为表现或表情来识别。

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Amplify motivation for doing the behavior with intrinsic and extrinsic motivators.

FORBES: Stanford's School Of Persuasion: BJ Fogg On How To Win Users And Influence Behavior

Our business world was built with perception that extrinsic rewards (such as money) are the drivers, which shape human behavior.

FORBES: Zara, Microsoft And GORE-TEX - Tapping Real-Time Instincts