1. High neural sensitivity: An individual's nervous system may be more sensitive and respond more quickly and strongly to external stimuli, making it easy to feel startled by sudden sounds, movements, or changes.
2. Psychological state influence: Anxiety, tension, depression and other psychological states may reduce psychological resilience, making people more susceptible to external factors, including increased response to shock.
3. Experience and Memory: Past experiences or traumatic memories may cause excessive vigilance and fear reactions when faced with similar situations, even if these situations do not pose a real threat in reality.