Spotting the Rehearsed Answer
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A rehearsed answer tends to arrive too smoothly: consistent phrasing, a practised cadence, little of the searching or self-correction that spontaneous speech usually contains. None of this makes the content false, but it does mean the interviewer is hearing a prepared version rather than a fresh one.
Recognising rehearsal is not a reason for suspicion on its own. Many subjects have simply told a particular story many times before and have every right to a polished account of their own experience. The interviewer's task is to decide whether the polished version is sufficient, or worth probing further.
A gentle way past a rehearsed answer is to ask for a detail that the polished version would not usually include: a specific sensation, an object in the room, a smaller moment adjacent to the main story. These smaller questions tend to break the practised rhythm and return something less scripted. A little variation is usually enough to bring something newer into view.