#28: Conservatism Bias

Bias number 28 is known as the conservatism bias. This is a bias that affects the way in which people alter their beliefs when given new pieces of information.

In short, people have a tendency to be slow, or conservative, in changing their beliefs when presented with evidence that challenges the held belief. People usually shift their existing belief insufficiently in accordance with new pieces of evidence, giving more weight to their currently-held beliefs than is appropriate. Some psychologists believe this is an extension of the anchoring bias that influences people to make decisions by continually referring back to a core belief, whether it is sound or not.

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