Liars, on the other hand, tend to focus on inventing a plausible story. Therefore, they may find it more difficult to answer unexpected questions about details they didn’t consider when creating the story.
Another interesting aspect is that those who tell the truth usually provide additional information, while those who fabricate a story often limit themselves to the essentials to avoid mistakes. This difference in narrative style can be an important clue for evaluating the credibility of an explanation.
Behavioral analysts point out that these two questions work because they increase what is called cognitive load: the mental effort required to maintain a lie. The greater this load, the more likely inconsistencies will appear in the story.
However, they also point out that no method can detect a lie with absolute certainty. Factors such as stress, nervousness, or differences in memory can influence how a person answers questions, even if they are telling the truth.
