Which is an example of a symptom related to catatonia?

Waxy flexibility is a symptom associated with catatonia, a condition characterized by a lack of movement and response to the environment. Specifically, waxy flexibility refers to the phenomenon where a person maintains a posture or position for an extended period, allowing their limbs to be moved by someone else and then holding that new position as if the body were made of wax. This symptom exemplifies the abnormal motor behavior typically observed in catatonia, where the individual exhibits either a significant reduction in movement or bizarre motor activities.

In contrast, rapid speech is associated with conditions such as mania or hypomania rather than catatonia. Persistent sadness is more indicative of mood disorders, such as major depressive disorder. Increased appetite may align with various psychological or physiological conditions but is not characteristic of catatonia.