A door suddenly slams. A balloon pops without warning. Fireworks explode nearby, and one person barely notices while another instinctively jumps, gasps, or feels their heart race. These reactions are common, yet people who startle easily are sometimes teased for being "too nervous" or "overreacting."
Psychology tells a different story. The human brain is designed to detect sudden changes in the environment. Unexpected sounds can activate automatic survival systems before the conscious mind has time to decide whether the situation is actually dangerous. While everyone has a startle response, the intensity of that response varies from person to person.
