Generalized-onset motor seizures may be further classified by type of seizure: Tonic-clonic seizures (formerly, grand mal seizures) Clonic seizures (sustained rhythmic jerking) Tonic seizures (generalized stiffening involving all limbs and without rhythmic jerking) Atonic seizures (loss of muscle tone) Myoclonic seizures (rhythmic jerking not preceded by stiffening) Myoclonic-tonic-clonic seizures (myoclonic jerking followed by tonic and clonic movements) Myoclonic-atonic seizures (myoclonic jerking followed by atonia) Epileptic spasms (formerly, infantile spasms) Generalized-onset nonmotor seizures may be further classified by type of seizure (defined by the earliest prominent feature): Typical absence seizures Atypical absence seizures (eg, with less abrupt onset or termination or with abnormal changes in tone) Myoclonic seizures Eyelid myoclonia All absence seizures are generalized-onset seizures.