Valence effect  

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Train wreck at Montparnasse (October 22, 1895) by Studio Lévy and Sons.
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Train wreck at Montparnasse (October 22, 1895) by Studio Lévy and Sons.

The valence effect of prediction is the tendency for people to simply overestimate the likelihood of good things happening rather than bad things. Valence refers to the positive or negative emotional charge some entity possesses.

This finding has been corroborated by dozens of studies. In one straightforward experiment, all other things being equal, participants assigned a higher probability to picking a card that had a smiling face on its reverse side than one which had a frowning face.

In addition, some have reported a valence effect in attribution when we overpredict the likelihood of positive events happening to ourselves relative to others. (See self-serving bias.)

The outcome of valence effects may be called wishful thinking. However, in certain situations, the valence effect may actually alter the event in some way so that it indeed results in a positive outcome. For example, in some cases generals have roused up their soldiers to a point where they were able to emerge victorious in battle.

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Unless indicated otherwise, the text in this article is either based on Wikipedia article "Valence effect" or another language Wikipedia page thereof used under the terms of the GNU Free Documentation License; or on original research by Jahsonic and friends. See Art and Popular Culture's copyright notice.

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