👉 An atonia is a type of involuntary muscle contraction that occurs when the sympathetic nervous system is activated. This phenomenon can be caused by various factors such as stress, illness, or trauma. In the context of medical and psychological conditions, an atonia may refer to a specific condition where the patient's autonomic nervous system becomes excessively sensitive to stimuli, leading to involuntary muscle contractions. It can also indicate a neurological disorder that affects the autonomic nervous system, such as Parkinson's disease or multiple