The startle response is a sudden, reflex-like response to an unexpected stimulus, such as a loud noise or bright light. It is an unlearned and largely unconscious defense mechanism shared by ...

Stand clear of the closing doors.

Joe Heller cartoon on holiday stress.

This advertisement has not loaded yet, but your article continues below.

The acoustic startle response is an unconditional reflex involving rapid facial and skeletal muscle movements triggered by sudden, startling stimuli like sound or light. Studying the acoustic ...

This advertisement has not loaded yet, but your article continues below.

Your trusted source for the latest news delivered weekdays from the team at U.S. News and World Report. Sign in to manage your newsletters » Sign up to receive the latest updates from U.S News ...

The startle reflex is a rapid and involuntary reaction to sudden and intense stimuli, such as loud noises or bright lights, providing valuable insights into the neural mechanisms underlying both ...