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Wishful thinking is the formation of beliefs and making decisions according to what might be pleasing to imagine instead of by appealing to evidence or rationality.

Studies have consistently shown that, holding all else equal, subjects will predict positive outcomes to be more likely than negative outcomes. See positive outcome bias.

As a logical fallacy

In addition to being a cognitive bias and a poor way of making decisions, wishful thinking can also be a specific logical fallacy in an argument when it is assumed that because we wish something to be true or false that it is actually true or false. This fallacy has the form "I wish that P is true/false, therefore P is true/false."[1]

For example:

The teacher gave us a difficult exam! We shouldn't have to be subjected to such stress under the course of our education.

It may be that it was uncomfortable, but that does not mean that uncomfortable things should always be avoided. Wishful thinking underlies appeals to emotion, and is a red herring.

See also


Further reading

  • Harvey, Nigel (1992). Wishful thinking impairs belief-desire reasoning: A case of decoupling failure in adults?. Cognition 45 (2): 141–162.
  • Gordon, Ruthanna (2005). Wishful thinking and source monitoring. Memory & Cognition 33 (3): 418–429.
  • Sutherland, Stuart (1994) Irrationality: The Enemy Within Penguin. ISBN 0140167269 Chapter 9, "Drive and Emotion"

External links

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