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Scientists Discover Neural Thermostat That Keeps Brain Running Efficiently

by Rajshri on  January 16, 2010 at 8:41 PM Research News   - G J E 4
 Scientists Discover Neural Thermostat That Keeps Brain Running Efficiently
A neural thermostat that helps brain run efficiently has been found by scientists from Yale University.

The neuronal thermostat regulates activity in the visual cortex, while processing a flood of sensory information.
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The actions of inhibitory neurons allow the brain to save energy by suppressing non-essential visual stimuli and processing only key information.

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"It's called the iceberg phenomenon, where only the tip is sharply defined yet we are aware that there is a much larger portion underwater that we can not see," said David McCormick, the Dorys McConnell Duberg Professor of Neurobiology at Yale School of Medicine, researcher of the Kavli Institute of Neuroscience and co-senior author of the study.

"These inhibitory neurons set the water level and control how much of the iceberg we see. We don't need to see the entire iceberg to know that it is there," he added.

The brain uses the highest percentage of the body's energy, so scientists have long wondered how it can operate both efficiently and reliably when processing a deluge of sensory information.

Most studies of vision have concentrated on activity of excitatory neurons that fire when presented with simple stimuli, such as bright or dark bars.

The Yale team wanted to measure what happens outside of the classical field of vision when the brain has to deal with more complex scenes in real life.

By studying brains of animals watching movies of natural scenes, the Yale team found that inhibitory cells in the visual cortex control how the excitatory cells interact with each other.

"We found that these inhibitory cells take a lead role in making the visual cortex operate in a sparse and reliable manner," McCormick said.

The research is published in the journal Neuron.

Source: ANI
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