After they finished lying to her, researcher Danielle Polage asked the students to again rate their certainty that each of these events had or had not happened. Fascinatingly (and a little creepily), subjects showed a statistically significant change in their beliefs, indicating that they became less sure that untrue events hadn’t happened to them after saying that they had. Conversely, when subjects were later asked to deny events that had happened to them, they became less sure that those events did take place.