Atonic seizures are also referred to as drop attacks and epileptic fall. Hughlings Jackson first described “sudden epileptic falls” in 1886. Unlike most epileptic seizures that involve either positive motor behavior (e.g., tonic, clonic, and myoclonic) or the absence of motor behavior (e.g., absence seizures), atonic seizures involve negative motor phenomena. The primary characteristic of an atonic seizure is a sudden loss of muscle tone that lasts 1-2 s. In a small number of cases, myoclonic jerks precede the loss of muscle tone; however, in most cases there is no warning (or aura). As a result, falls and injuries are common. The seizure is accompanied by a brief period of unconsciousness lasting 300 ms to 3 s and has an electroencephalogram (EEG) pattern of bilateral synchro nous polyspike wave and spike wave.