Maybe myoclonus, though I have no medical background tbh.
What is myoclonus?
Myoclonus refers to sudden, brief involuntary twitching or jerking of a muscle or group of muscles. The twitching cannot be stopped or controlled by the person experiencing it. Myoclonus is not a disease itself, rather it describes a clinical sign.
Myoclonic
jerks may occur in the following scenarios:
- Either alone or in sequence, in a pattern of movement or without pattern
- Infrequently or many times per minute
- In response to an external event or when a person attempts to make a movement