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The variation in sentence length and complexity within a text. Human writing is typically bursty; AI writing tends to be uniform.
Burstiness measures how much sentence structure varies throughout a document. Human writers naturally alternate between short, punchy sentences and long, complex ones. They use fragments, questions, and varying paragraph lengths. AI models, trained to optimize for coherence, tend to produce more uniform sentence structures. AI detectors analyze burstiness alongside perplexity to distinguish human from AI text.