Which type of seizure is characterized by significant motor activity and a complete loss of consciousness?

The type of seizure characterized by significant motor activity and a complete loss of consciousness is the Grand Mal seizure, also known as a Tonic Clonic seizure. During this type of seizure, the individual experiences two main phases: the tonic phase, where there is a muscular stiffening and loss of consciousness, followed by the clonic phase, which involves rhythmic jerking of the body's muscles. This seizure type presents the most noticeable motor activity and results in a total absence of awareness, aligning perfectly with the characteristics described in your question.

In contrast, Status Epilepticus refers to a prolonged seizure or a series of seizures without recovery in between, which can include a variety of seizure types but isn't specifically defined by the combination of significant motor activity and loss of consciousness in a singular episode. Petit Mal seizures, also known as absence seizures, typically involve brief lapses in awareness without major motor activity, often seen in children. Focal seizures may involve only part of the brain and can manifest as localized motor activity or altered consciousness, but they do not reflect the full-body convulsions seen in Grand Mal seizures.