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In information theory, the percentage of a message or text which could be eliminated without loss of information. Up to 50% of the letters in most conventional written prose messages could be randomly removed and the original could still be reconstructed by a native speaker of that language because of contextual cues such as semantics, syntax, and morphology, all of which function to reduce uncertainty: such messages have a redundancy of 50%. Texts using broadcast codes have a high degree of redundancy—being structurally simple and repetitive (overcoded). In perception, there is always more sensory data than we need to be aware of—we don't need to see much to fill in the gaps. In communication generally, redundancy helps to compensate for noise. Such redundancy facilitates selective perception. Compare overdetermination.

Subjects: Media Studies.

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