A cognitive bias is when someone makes a bad choice that they think is a good choice. This bias is an important part of the study of cognitive psychology, which looks at basic actions of the mind, such as thought, feeling, problem solving, memory, and language.
Cognitive biases are often a side effect of evolutionary changes. Some behaviors that were beneficial for primitive humans and animals are unsuited to modernity. Others are adaptive and may lead to more effective actions in a given context.
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The Daily Omnivore 