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The Primacy Error

Primacy error is where the first impression we have of someone or something continues despite contrary evidence. Later evidence is interpreted in light of our pre-formed beliefs.

The Primacy error is one form of the availability error: the early opinions (or items) are immediately available in our minds when we encounter later information. These beliefs or opinions act as a filter on subsequent information.

Once we've formed an opinion we stop looking for things that go against our hypothesis (confirmation bias).