April 15, 2008

Brain Decides Faster Than You Think

Study: Decisions Are Made Up To 10 Seconds Faster Than People Realize

  •  (CBS/iStockphoto)

(WebMD)  Talk about quick thinking: The brain may make some decisions up to 10 seconds before those decisions bubble up to conscious thought, a new study shows.

In the study, 14 men and women aged 21-30 sat at computers and watched random letters pop onto the screen, one at a time. When they felt like it, participants clicked on one of two computer keys and noted the letter that was on the computer screen when they made that decision.

Meanwhile, they got brain scans using functional magnetic resonance imaging(fMRI) to show brain activity linked to their decisions.

Those brain scans showed activity in two regions in the brain's frontal and parietal cortex that predicted, by up to 10 seconds, the conscious decision to press either computer key.

"This suggests that when the subjects' decision reached awareness it had been influenced by unconscious brain activity for up to 10 seconds," write the researchers.

They included John-Dylan Haynes, PhD, of Germany's Max Planck Institute for Human Cognitive and Brain Sciences and the Bernstein Center for Computational Neuroscience.

Their findings appear in the April 13 advance online edition of Nature Neuroscience.

By Miranda Hitti
Reviewed by Louise Chang
©2005-2008 WebMD, LLC. All rights reserved.
Add a Comment
by erasmus6 April 16, 2008 11:11 PM EDT
The brain is my favorite subject!
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by gurusavant April 15, 2008 7:52 PM EDT
wow. that is truly amazing.
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by stn_sage April 15, 2008 6:19 PM EDT
I don''t find this to be surprising.
Sometimes I feel like my brain has made a decision quicker than I can respond physically with my extremities.
There are other interesting brain research projects being conducted as well.
Reply to this comment

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