Atonic seizure Focal motor seizure Focal atonic seizure 2020-02-24T14:54:22Z Localized atonic seizure A focal seizure characterized at onset by sudden loss or diminution of muscle tone without apparent preceding myoclonic or tonic activity, typically lasting more than 500 ms but less than 2 seconds. It may involve the head, trunk, jaw or limb musculature. Localised atonic seizure Localised hypotonic seizure Segmental atonic seizure Localized hypotonic seizure Partial atonic seizure Segmental hypotonic seizure Partial hypotonic seizure