How Fast Is Human Scream?

Air leaves the human throat at 80 m/s during a full-volume scream. Screams have a unique 'roughness' that bypasses normal auditory processing and triggers the brain's amygdala directly — wired to demand immediate attention.

Human screams contain frequencies between 30-150 Hz that don't appear in normal speech — a unique 'rough' acoustic profile that's also found in alarm calls of many primates.

• Faster than helicopters cruise
• Triggers the brain's alarm centre directly