Sunday, September 27, 2009

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HOW THE BRAIN CREATES NEW CONCEPTS

A research highlights the central role of the hippocampus, reveals that to perform an essential function of "advice" in respect of decision-making modules of the prefrontal cortex


How form
the concepts? "Even if a poodle and a golden retriever displayed very different from each other, we can easily appreciate the common attributes because we recognize in them examples of a particular concept, in this case the dog," said Dharshan Kumaran 's University College London , who directed a study, now published in the journal Neuron , "which explains some basic steps of this process. The way which concepts are formed in the brain and help to guide our choices are still very far from being clarified. The prevailing hypothesis is that to have a critical role in the acquisition of conceptual knowledge is the hippocampus, a structure essential for memory formation. However, so far we did not have solid evidence to confirm this hypothesis. Kumaran and colleagues expressing some well designed that allows you to map the emergence and application of new concepts in cervello.I entities in question were participating in a game where they had the opportunity to achieve a gain correctly predict whether a series of days virtual time was sunny or rainy on the basis of what it looked like the night sky of the previous days, described through a series of diagrams on a computer monitor. Before each experimental session subjects were given to memorize a pattern of outcomes associated with each pattern of the night sky. Several groups of these patterns were also conceptually related to each other (such as poodles and golden retriever), thus recognizing that the affinity was easily passed the test successfully. Subsequently, the subjects could apply the knowledge thus gained in further tests in which the concepts were similar to the patterns appears again. Through a series of behavioral and neural measurements, the researchers were able to discover that to preside over the emergency conceptual knowledge of a brain circuit that is functionally coupled sees the hippocampus and prefrontal cortex ventromediale.Tuttavia, was only the observation of the hippocampus that may predict which individuals would be able to successfully apply the concepts learned to new situations. "This suggests that the hippocampus is likely to create and store these concepts, before moving to the prefrontal cortex when they can be exploited," says Kumaran. "Our study offers a new perspective on the human capacity to discover the conceptual structure of visual experience, and reveals that the regions of the so-called 'memory', such as the hippocampus, together with 'modules decision 'of the prefrontal cortex makes this information available. "(dd)
TAKEN FROM
http://www.lescienze.it/

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