"inducing a good mood in the participants caused an increase in the scope of their field of vision, whereas inducing a negative mood reduced their visual field" (source: http://scienceblogs.com/neurophilosophy/2009/06/how_we_feel_affects_what_we_see.php)
We tend to talk about people getting fixated on a pessimistic vision and, thus, missing any and all evidence that contradicts said vision. Interesting that there's a visual-processing analogue to the psychological phenomena.
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