Brain & Bias

Our group got into a bit of a row over dinner last night because a rather opinionated guest said that anyone who was biased against (such-and-such) was an unmitigated idiot. How does the brain deal with bias?

Merriam-Webster dictionary describes the noun “bias” as a tendency to believe that some people, some ideas, etc., are better than others, which usually results in treating some people unfairly. Wikipedia puts it this way: Bias is an inclination or outlook to present or hold a partial perspective, often accompanied by a refusal to consider the possible merits of alternative points of view. When the word bias is used as a verb, one definition puts it this way: to feel or show inclination or prejudice for or against someone or something. Interestingly enough, it appears that the human brain comes with a specific built-in bias. 

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