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Our unconscious brain makes the best decisions possible
Date:12/24/2008

Researchers at the University of Rochester have shown that the human brainonce thought to be a seriously flawed decision makeris actually hard-wired to allow us to make the best decisions possible with the information we are given. The findings are published in today's issue of the journal Neuron.

Neuroscientists Daniel Kahneman and Amos Tversky received a 2002 Nobel Prize for their 1979 research that argued humans rarely make rational decisions. Since then, this has become conventional wisdom among cognition researchers

Contrary to Kahnneman and Tversky's research, Alex Pouget, associate professor of brain and cognitive sciences at the University of Rochester, has shown that people do indeed make optimal decisionsbut only when their unconscious brain makes the choice.

"A lot of the early work in this field was on conscious decision making, but most of the decisions you make aren't based on conscious reasoning," says Pouget. "You don't consciously decide to stop at a red light or steer around an obstacle in the road. Once we started looking at the decisions our brains make without our knowledge, we found that they almost always reach the right decision, given the information they had to work with."

Pouget says that Kahneman's approach was to tell a subject that there was a certain percent chance that one of two choices in a test was "right." This meant a person had to consciously compute the percentages to get a right answersomething few people could do accurately.

Pouget has been demonstrating for years that certain aspects of human cognition are carried out with surprising accuracy. He has employed what he describes as a very simple unconscious-decision test. A series of dots appears on a computer screen, most of which are moving in random directions. A controlled number of these dots are purposely moving uniformly in the same direction, and the test subject simply has to say whether he believes those dots are moving to the left or
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Contact: Jonathan Sherwood
jonathan.sherwood@rochester.edu
585-273-4726
University of Rochester
Source:Eurekalert

Page: 1 2 3

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