Medically reviewed by Jonathan B. Jassey, DO Key Takeaways The Moro reflex is a startle response in babies that makes their ...

Hyperekplexia is a genetic condition characterized by an exaggerated startle reaction to sudden loud sounds, movement, or touch. The muscles may stiffen as a result. Hyperekplexia is a rare condition.

We all jump at an unexpected noise or touch, but in some people, this startle response is exaggerated, and can cause falls and even death. Now, researchers in the United Kingdom have found new genes ...