However, the argument is logically unsound because not all flowers have petals. Most people would find this argument acceptable because everyone knows that daffodils are flowers. A deductive argument moves from the general to the specific, and it is logically valid only when both premises are true.įor example, consider the following argument: “All flowers have petals daffodils have petals therefore, daffodils are flowers”. A syllogism is a type of deductive argument consisting of two premises and a conclusion that follows from the premises (e.g., “All men are human all humans are mortal therefore, all men are mortal”). This leads us to accept arguments as true because they make sense to us (i.e., they are believable), and not because they are logically valid.īelief bias occurs in the context of syllogistic reasoning. With belief bias, our knowledge about the world influences how we evaluate arguments. Belief bias is a cognitive bias that causes us to judge the validity of a claim or conclusion based on how believable we find it.
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