1. Headline
  1. Headline
By
updated 3/20/2012 9:01:47 PM ET 2012-03-21T01:01:47

No one knows what led a Florida neighborhood watch captain to shoot Trayvon Martin, a teenager carrying no weapon.

  1. More from TODAY.com
    1. Join the TODAY Parenting Team! We're all in this together

      Please share your best advice, toughest questions and cutest photos to our first challenge: What do you wish you'd known b...

    2. Savannah Guthrie: What I wish I knew before Vale
    3. Why you need to join the TODAY Parenting Team community
    4. Would you let your dentist give you Botox?
    5. Curt Schilling defends his daughter against vulgar Twitter replies

But a new study raises an intriguing question: Could the watch captain have been fooled into thinking the youth was armed in part because he himself was holding a gun?

In the study, volunteers who held a toy gun and glimpsed fleeting images of people holding an object were biased toward thinking the object was a gun.

It's another indication that the brain shapes what we perceive in the world beyond the information that comes in through our eyes, said James Brockmole of the University of Notre Dame, who did the work with psychologist Jessica Witt at Purdue University.

In a telephone interview, Brockmole stressed he had no inside information on the Feb. 26 shooting of 17-year-old Martin, who was shot and killed in a gated community in Sanford, a suburb of Orlando. The neighborhood watch captain, George Zimmerman, said he shot the teen in self-defense because the youth attacked him. The case has drawn outrage and protests, and the federal Department of Justice said Monday it will investigate.

Brockmole said it's possible that Zimmerman's perception might have been skewed by being armed.

Race may have also played a role. Martin is black; Zimmerman's family says he is Hispanic. Past research suggests that people can be more likely to perceive a poorly seen object as a gun if it's held by a black person than by a white person, experts say.

Zimmerman has not spoken publicly. The police report does not mention whether he thought Martin had a firearm. But during his patrol of the neighborhood in his SUV, Zimmerman called 911 and told a police dispatcher that he was following Martin. "We've had some break-ins my neighborhood. ...There is a really suspicious guy."

Then a bit later, he said the youth was approaching and "he's got something in his hands."

In the study which was carried out well before the shooting, undergraduates at Notre Dame and Purdue glimpsed scenes of people holding objects and had to decide quickly whether the object was a gun. The results showed they were biased toward thinking so if they themselves were holding a toy gun, rather than a plastic ball. Just having a gun nearby didn't make a difference, researchers found.

Why is that? Brockmole said people are primed to act in the world rather than just passively see it. So their minds have to contain information both about what they see and what they might do in response. Evidently, each kind of information can influence the other, he said.

He said the work is not intended to support gun control, but it suggests that people should know that when they hold a gun "that might change how you're going to interpret what's around you."

Brockmole's findings make sense, said Evan Risko, who studies perception and attention at Arizona State University. "Our perception is influenced by a number of different factors, and that can have important consequences," he said.

Dennis Proffitt, who studies visual perception at the University of Virginia, said there are many reasons why one person might think another is armed, such as if he is worried about his own safety or if he thinks the other person is a robber. The effect of holding a gun oneself "could be part of the story" in Florida, he said.

Copyright 2012 The Associated Press. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.

Discuss:

Discussion comments

,

Most active discussions

  1. votes comments
  2. votes comments
  3. votes comments
  4. votes comments

More on TODAY.com

  1. TODAY

    Join the TODAY Parenting Team! We're all in this together

    3/3/2015 1:47:35 PM +00:00 2015-03-03T13:47:35
  1. Planter bookends, etched glass and more DIY projects you really can do

    Still not sure you have what it takes to do a DIY project? Brit Morin, founder and CEO of Brit + Co., is here to help.

    3/3/2015 2:46:29 PM +00:00 2015-03-03T14:46:29
  1. Courtesy of Savannah Guthrie

    Savannah Guthrie: What I wish I knew before Vale

    3/3/2015 1:39:31 PM +00:00 2015-03-03T13:39:31
  1. TODAY

    Why you need to join the TODAY Parenting Team community

    3/3/2015 2:16:06 PM +00:00 2015-03-03T14:16:06
Natalie and Willie on being parents
  1. Natalie: I wish I’d known this about Mom Guilt

    We can’t be there every moment and the hardest part is learning to let go a little, to give your kids the confidence and tools they need to be happy, well-adjusted, successful little people and then young adults.

    3/3/2015 2:39:48 PM +00:00 2015-03-03T14:39:48
  2. Willie: I’m glad I was (mostly) clueless as a first-time dad

    It probably would have been too scary thinking about the responsibility that was about to smack me in the face.

    3/3/2015 2:39:36 PM +00:00 2015-03-03T14:39:36