Symptoms of juvenile absence epilepsy include generalized tonic - clonic seizures, and myoclonus may also occur. Patients with absence petit mal seizures often experience a loss of consciousness, accompanied by myoclonus or automatisms. The duration of a single seizure ranges from a few seconds to more than ten seconds. Most patients also have simple partial seizures. A certain part or one side of the patient's limb fails to move normally, presenting as clonic seizures or experiencing abnormal sensations. Patients with juvenile absence epilepsy may have psychic sensory, psychic motor, and mixed seizures. Abnormalities occur in the patient's perception and emotions. In severe cases, patients may engage in violent behaviors such as hurting others or self - harm under the control of hallucinations or delusions.