For many years it was considered the center of the amygdala fear (amygdala) in the brain. The results of many experiments involving animals and humans indicate that this is the area formed by the terrible, horrible, panic emotions. Now, experts from the University of Iowa said that the brain has a number of other structures that create havoc, so that we may fear and without the participation of the amygdala.
In a study by American scientists took part people suffering from the disease Urbach-Vite. It is a genetic disease robs fear. The amygdala in these patients hardens, shrinks and collapses, which is why they almost did not react to the horror, are not afraid of huge spiders, snakes, and other things that ordinary people are capable of causing panic.
Scientists believe that the amygdala triggers fear and panic with an increase in carbon dioxide in the blood that indicate overspending oxygen and the threat of deterioration. If the amygdala is not functioning, the carbon dioxide can not produce a deterrent effect.
The researchers asked 12 healthy volunteers and 3 "fearless" person suffering from a genetic disease Urbach-Vite breathe a gas mixture in which the CO2 content was 35%. All subjects immediately experienced anxiety attack, and that really surprised scientists, patients participants fear was stronger than healthy. One patient at all for the first time in my life experienced fear.
Based on this, experts have suggested that the amygdala - no monopoly on management fears. According to scientists, what its role is in response to fearful stimuli, is undeniable. However, it is difficult to determine its participation in the awareness of fear. Researchers believe that the amygdala responds only to external threats, but the panic and horror can come to a person in different ways - as a response to external stimuli, and the behavior of others, or in relation to snakes, spiders, etc.
Scientists plan to continue to study in volunteers with the disease Urbach-Vite, that soon may allow them to open new centers of fear and panic in the human brain.