Cognitive bias is a pattern of deviation in judgment that occurs in particular situations, leading to perceptual distortion, inaccurate judgment, illogical interpretation, or what is broadly called irrationality. Implicit in the concept of a "pattern of deviation" is a standard of comparison with what is normatively expected.

Questions having the bias tag regards cognitive bias in general.

Reference: http://en.wikipedia.org/wiki/Cognitive_bias

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