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New research has found that our mood changes the way that we see things.
The study, conducted by the University of Toronto, discovered that a person's visual cortex changed depending on whether or not they were in a good or bad mood.
Adam Anderson, a professor of psychology at the Canadian university, said: "Specifically our study shows that when in a positive mood, our visual cortex takes in more information, while negative moods result in tunnel vision."
The study was conducted buy showing subjects a number of images that were designed to generate a specific mood.
Lead author of the study Taylor Schmitz claimed that being in a positive mood could "result in distraction".
"Good moods enhance the literal size of the window through which we see the world. The downside is that this can lead to distraction on critical tasks that require narrow focus, such as operating dangerous machinery."
The research has been published in the Journal of Neuroscience.
