Explain why impulsive behaviour is described as common enough in catatonia specifically, despite also occurring in people without mental illness.

Impulsive behaviour is common enough in catatonia, where a patient may suddenly strike another person, throw an object, or smash something, with no identifiable reason once the act has occurred and no build-up that would have allowed it to be anticipated, which relates to the broader disturbance of motor control and behavioural regulation seen in catatonic states. A tendency toward impulsive action on the spur of the moment also occurs in people without mental illness, but in catatonia the pattern is recognised as a specific, sudden, motiveless motor phenomenon worth documenting in its own right, since its unpredictable and potentially dangerous nature has direct implications for patient and staff safety on a ward.