Case File 240 · Investigation Psychology

Can a Rehearsed Story Still Be True?

By Murder Book Editorial TeamPublished by Gungrounds, the studio making Murder BookPublished 3 October 2026Updated 3 October 2026

Yes. Rehearsing an account does not make it false, and a well-practised story is not evidence of deception. Honest people rehearse all the time: they run through what they will say before a job interview, a difficult conversation or a police statement, and they repeat important events until the telling becomes smooth. The research on lie detection backs this up. Cues to deception are weak to begin with, and having time to prepare removes some of the few that exist, so a polished story looks much the same whether it is true or false. There is a catch worth knowing about: a rehearsed, familiar account tends to feel more convincing to listeners, and sometimes to the teller, without being any more accurate.

Key takeaways

A rehearsed story can be completely true; practice changes how an account is delivered, not whether it happened.
People rehearse for ordinary reasons, including nerves, the importance of the event and simply having told the story before.
Research finds deception cues are weak, and preparation tends to remove the few faint signals, so rehearsal does not separate liars from truth tellers.
Repetition raises how true a statement feels, regardless of its actual accuracy, so a smooth story can mislead listeners.
Each retelling can also nudge a genuine memory, which is a reason to check facts rather than to judge polish.

Why do people rehearse their stories?

Rehearsal is normal, not suspicious. Someone about to be interviewed often prepares because the stakes feel high and they do not want to freeze or forget something important. People who have lived through a distressing event may have gone over it many times in their own minds, or recounted it to family, a doctor or an earlier interviewer, long before any formal questioning. Each of those tellings is a rehearsal.

By the time an account reaches an interview room, it may have been told a dozen times. That history makes the story flow. It does not make the underlying events any more or less real. Expecting a truthful person to sound spontaneous and unpractised misunderstands how memory and conversation actually work.

Does rehearsal change the signs of lying?

This is where popular belief and research part company. Many people assume a rehearsed answer gives a liar away by sounding too slick. The evidence points the other way.

The large 2003 meta-analysis by DePaulo and colleagues examined 158 possible cues to deception across more than a thousand estimates and found most were weak or unrelated to lying. Importantly, the researchers found that the strength of such cues depended on circumstances, including whether people had a chance to plan what they would say. Planned, rehearsed accounts were generally told more fluently and with fewer hesitations than unplanned ones.

The consequence is counter-intuitive. Rehearsal smooths delivery for everyone, honest or not. It reduces the hesitations, false starts and filled pauses that observers often read as signs of lying, which means a prepared truth and a prepared lie end up looking alike. Bond and DePaulo's 2006 review found people judge truths and lies at only about 54% accuracy even without this complication. A 2019 Annual Review of Psychology summary by Vrij, Hartwig and Granhag described the nonverbal cues to deceit as faint and unreliable. Rehearsal makes an already unreliable signal weaker, not stronger. On the related worry about shifting accounts, see whether inconsistent behaviour is evidence of deception.

Does a smooth, familiar story feel more true?

There is a genuine risk hidden in rehearsal, but it falls on the listener, not the facts. A statement that is easy to process feels more truthful, an effect that has nothing to do with whether it is correct.

The classic demonstration is the illusory truth effect. Hasher, Goldstein and Toppino reported in 1977 that simply repeating a plausible statement raised how true people rated it, whether or not it was actually true. A 2010 meta-analysis by Dechêne and colleagues confirmed a reliable, medium-sized effect across dozens of studies and linked it to processing fluency: repetition makes a statement easier to take in, and the mind mistakes that ease for truth.

A rehearsed story benefits from exactly this ease. It is fluent, familiar and quick, so it can sound more credible to an interviewer, a jury or a friend than a halting, first-time account of the same events. That is a reason to be careful: the feeling of truth that a polished story produces is not a measure of its accuracy. The same mechanism also means a scripted-sounding response deserves scrutiny rather than automatic belief or automatic suspicion.

Can repeated telling change the memory itself?

Rehearsal can do more than smooth delivery. Memory is reconstructive rather than a fixed recording, as Loftus and Palmer showed in their 1974 study, in which the wording of a question later shifted what people remembered seeing. Each time an event is recalled, it is partly rebuilt, and that rebuilding can let in small errors, assumptions and details picked up from other sources.

This means a sincerely rehearsed account can drift over time without the person intending anything dishonest. They may smooth over uncertainties, settle on one version of an ambiguous detail, or absorb information from news coverage or other people's accounts. The story stays honest in intent while becoming less faithful to the original event. The wider process is covered in what the misinformation effect is and why people revise their story during questioning.

So how can you tell whether a rehearsed story is true?

Not from the rehearsal. Because preparation changes delivery but not the facts, the honest answer is that polish tells you almost nothing either way. What helps is the same thing that helps with any account:

Independent corroboration. Does other evidence, from records, locations or third parties, support the account?
Checkable detail. A truthful account often contains specifics that can be verified, which is the basis of the verifiability approach.
Openness to new information. A genuine memory can usually accommodate unexpected, checkable questions, whereas a brittle story may only repeat its fixed form.

The goal is to test the content against the world, not to grade the performance.

Is there a game about rehearsed accounts?

Murder Book: The Art of Interrogation, an upcoming narrative interrogation game from Gungrounds, is built on the idea that a confident, well-told story is not the same as a true one. You examine unreliable accounts, weigh contradictions and look for the narrative gaps a smooth delivery can hide, rather than trusting whichever version sounds most practised. Its press kit lists Fabrication and Narrative Gaps among the behaviours in play, and development materials show an evidence board that links statements to what can actually be checked.

That mirrors the research here: rehearsal changes how a story sounds, not whether it is true, so the work is weighing it against evidence. Cases are designed for focused 5–10-minute sessions. Murder Book is in development for PC (Steam) and mobile, with release currently planned for the end of Q2 2027.