Epilepsy is a disorder of the brain that causes brief changes in how the brain's electrical system works. This change in brain activity can lead to a seizure (see Epilepsy Symptoms) . It is not known exactly how lamotrigine works for treating epilepsy. Studies suggest that it may work by affecting sodium channels in the brain, preventing the abnormal activity from spreading to other parts.
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So the system may work at first only on some highways, or in other specific situations. âItâs not going to be George Jetson from day one,â he said. A version of this article appears in print on October 28, 2012, on page AU1 of the New York edition with the headline: Yes, Driverless Cars Know the Way to San Jose.