One network increases the amount of information to make the right choice, while others tend to lower the threshold for a fast decision making.
The team believes that this result holds the key to the development of better treatments for neurological disorders such as Parkinson's disease.
The discovery, made of experimental neurology at the University of Oxford, sheds new light on the internet, that determine who we quickly choose an option, and how much information we need to make that choice.
Over the centuries, researchers have studied the relationship between speed and accuracy in the decision-making process.
And many studies have shown that subthalamicus brain areas play a central role.
"The study of the behavior of the earlier decision making does not tell us about the actual events or network responsible for making adjustments to the speed-accuracy," said lead author Peter Brown, Professor of experimental neurology at the University of Oxford.
We want to solve this by measuring the exact location and time of electrical activity in the subthalamicus and compare the results with behavioral data collected when the decision-making tasks done.
Brown and his colleagues recruited 29 participants in total.
About 11 of them afflicted with Parkinson's disease and the team learned that reaction time.
The second group, unhealthy, is asked to perform tests of moving-dot-they must decide if the cloud is moving the point of traveling to the left or right.
But to make the test more difficult, researchers want to change the number of points that move in one direction.
And the participants also receive a random alternate instructions to perform the speed as well as accuracy.
The researchers noted that it was easier for healthy subjects to take quick decisions, when the task is easier-where the point is moving in one direction.
And it's easy for them to choose the option when you are prompted to take quick decisions.
It also found that there is another error was committed when the participants spend more time thinking about their decision after being ordered to emphasize accuracy.
A model of computation shows that the brain longer try harder to collect information necessary for critical thresholds and make decisions.
When the participants were asked to focus on speed, this limit is significantly lower than when they focus on accuracy.
The next step is to specify the network that is activated in the brain that control the behavior of the change and the trade-offs between rapid and precise decisions,» explains first author and PhD student Damian Herz.
We measured the electrical activity of groups of nerve cells in subthalamicus in patients with Parkinson's disease, which has recently been treated with deep Brain Stimulation.
"We found two separate nerve networks are different in the way they ordered and how they respond to the task.
' One network increases the amount of information before making a decision and therefore more likely to be activated when accuracy is important, while the other networks are likely to be lower this threshold, especially when choices have to be made quickly.
The results add to the growing evidence that the region of the brain cortex pre-frontal contribute to decision making and open to more interesting streets to explore.
"We know that the changes in the activity of one of the sites, we also identify the control associated with the movement," added brown.
' The relationship between neural networks this can mean that a single signal responsible for quick decisions and adjustments in the resulting movement.
"A better understanding of the mechanisms can make it available for therapeutic interventions focus on the specific neural circuits to improve the treatment of neurological disorders in."
0 comments: