Which symptom may occur in simple partial seizures?

In the context of simple partial seizures, isolated motor activity is indeed a hallmark symptom. Simple partial seizures, also known as focal seizures without loss of consciousness, typically manifest as involuntary movements or localized muscle contractions that might affect one part of the body. This could include twitching, jerking, or other motor movements that occur without the individual losing awareness or consciousness.

Isolated motor activity can manifest in various ways, such as a twitching of a single limb or face, and is highly characteristic of these types of seizures. The person experiencing the seizure is usually fully aware of their surroundings and can recall the event afterward, which distinguishes it from other seizure types where awareness may be compromised.

The other options do not apply to simple partial seizures as they either describe symptoms associated with more complex seizure types or other neurological conditions. For example, absence of awareness is more indicative of complex partial seizures or generalized seizures, uncontrollable shaking suggests generalized tonic-clonic seizures, and severe confusion is often related to postictal states following seizures or other neurological events. Hence, isolated motor activity is the correct symptom to associate with simple partial seizures.