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CHEYENNE, Wyoming — The defense in the Nathanial Castellanos double murder trial is arguing that trauma can cause people to be mistaken about their memories.

A psychology professor from the University of Nevada at Reno, Deborah Davis, took the stand Wednesday in Cheyenne as the defense began presenting its case. The Wyoming Tribune Eagle (http://bit.ly/1ccXfEE) reported that she said people can remember things that didn't happen at all or change events that did occur.

She didn't mention anyone by name but a key witness in the case was wounded in the shooting that left two others dead.

Last week, 25-year-old Amber McGuire said she was positive the 34-year-old defendant was the person who shot her and two others in August 2011.

Castellanos' lawyers maintain an unidentified person shot them.

Information from: Wyoming Tribune Eagle, http://www.wyomingnews.com