Leveling and sharpening
Retold memories lose some details and exaggerate others.
What it means
Leveling and sharpening describe two complementary distortions that accumulate as a memory or story is repeatedly recalled or transmitted: leveling flattens the account by dropping details and reducing it to a simpler gist, while sharpening selectively emphasizes and amplifies a few salient features. Together with assimilation — reshaping content toward the rememberer's expectations and culture — they were Allport and Postman's account of how rumors transform along a chain of retellings. The phenomena are concrete manifestations of reconstructive memory operating over time and social transmission. They explain why rumors and oral histories drift toward shorter, more vivid, and more stereotype-consistent forms. They remain relevant to misinformation, gossip, and the cultural evolution of narratives.
Examples
A complex incident, passed person to person, becomes a short tale with one dramatic detail blown out of proportion.
A restructuring memo becomes 'they're cutting the whole floor' by the third coffee break: the caveats and the timeline drop away while one number swells.
A family holiday story sheds the flat tyre, the queue and the rain with each retelling, keeping only the waiter who dropped the cake — bigger every year.
First described in Allport & Postman (1947); rooted in Bartlett (1932).