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As the investigation continues into last month's fatal shooting of Trayvon Martin, the unarmed black teenager killed by a neighborhood watch volunteer in Florida, psychology researchers can point to one aspect of the tragedy: how easy it is to "see" that someone is holding a gun when he is not.
In the latest research, scientists found that simply holding a gun, as George Zimmerman was when he confronted Martin in a gated community in Sanford, Florida, has an effect.
"The mere act of holding a gun makes it more likely that you will perceive an object as a gun," said James Brockmole, associate professor of psychology at the University of Notre Dame and co-author of an upcoming paper on that phenomenon.