If you're bad drivers could be due to a gene, a study suggests it comes from California. According to scientists at the University of Irvine for 20% of people with a particular variant of a gene led to a test worse than others. A new test carried out after a few days gave the same result and according to the researchers, this gene is present in 30% of Americans. "These people make more mistakes of others while driving and are quickly forgotten what they learned , "said Steven Cramer, professor of neurology and author of the study. This gene variant limits the availability of a protein called BDNF, which is secreted by neurons and belongs to family of neurotrophins. The BDNF protein is used to preserve the memory and provides support for communication between brain cells. When a person is engaged in a particular task such as while driving BDNF is released in the area of \u200b\u200bthe brain associated with this activity to help body to react. Previous studies have shown that in people with the gene variant in question only a smaller part of the brain is stimulated compared to those with a normal gene, the first also react worse after a heart attack. Against this background, the researchers wondered if the variant may also affect the way of driving. "We wanted to study the behavior driving - Stephanie says McHughen, author of the study - because it seemed a good choice, most people know how to do . The driving test was conducted on 29 people, 7 with and 22 without the gene variant. It 'been asked to lead for 15 laps with a mortgage that required them to learn a difficult path with curves and discontinue.Quattro days after the test was repeated. The results showed that people with the gene variant did worse than others at both tests and especially to the second round remembered little or nothing of what they had learned. " behaviors of people come from hundreds and hundreds of events neuorafisologici, it was surprising to see how this exercise has shown difference in people who had this type of gene ," said Dr. Cramer. The results were recently published in the journal Cerebral Cortex.