Which of the following describes a common symptom of Locked in Syndrome?

A hallmark symptom of Locked-in Syndrome is the inability to speak, which is a direct result of paralysis affecting the muscles used for speech. Individuals with this condition typically retain full cognitive function and awareness while losing voluntary control over their muscles, often leading to a complete inability to move or communicate verbally. They may be fully aware of their surroundings and capable of understanding, but their ability to express this through speech is severely impaired.

The other symptoms listed are not characteristic of Locked-in Syndrome. For instance, severe confusion and the inability to recognize faces imply cognitive impairments, which are typically not present in individuals with this syndrome. Instead, they usually remain mentally intact. Loss of muscle tone relates more to various neuromuscular disorders rather than specifically defining Locked-in Syndrome, where there’s often preserved muscle tone in certain muscles despite the paralysis experienced.