And it’s not why you think. From my neurolaw archives, in a lab related abstract-
Human social cognition critically relies on the ability to deceive others. However, the cognitive and neural underpinnings of deception are still poorly understood. Why does lying place increased demands on cognitive control?
Common guesses were because we need to develop and keep our story straight or maybe because we have to stop ourselves from telling to the truth and stick to the story. Using ERPs, Carrión, Keenan and Sebanz found that:
…the challenge is to handle the cognitive conflict resulting from the need to keep others’ mental states in mind while deceiving them. via