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The human mind is incredibly averse to uncertainty and ambiguity; from an early age, we respond to uncertainty or lack of clarity by spontaneously generating plausible explanations. What’s more, we hold on to these invented explanations as having intrinsic value of their own. Once we have them, we don’t like to let them go.

Heightened need for cognitive closure can bias our choices, change our preferences, and influence our mood. In our rush for definition, we tend to produce fewer hypotheses and search less thoroughly for information. We become more likely to form judgments based on early cues (something known as impressional primacy), and as a result become more prone to anchoring and correspondence biases (using first impressions as anchors for our decisions and not accounting enough for situational variables). And, perversely, we may not even realize how much we are biasing our own judgments.

In 2010, Kruglanski and colleagues looked specifically at the need for cognitive closure as part of the response to terrorism.

It’s a consistency machine, really, is what he’s saying, and there’s all these ways that we’re looking for consistency. We need to establish order after experiencing disorder, and yes, it’s driven by the need for closure.And it’s simply because the world is incredibly complex. The psychologist Jordan Peterson calls this the miracle of simplification. There’s just—there’s too much. So we need to constantly be reducing non-identical things to identical things, according to our preconceptions. Also we have to act. “Do I do A or B?”—there has to be some mechanism that makes us want to resolve that. Otherwise we would just deliberate forever, we would never act.