Scary movies and haunted houses: Researchers study how the brain responds to fear

Everyone knows someone — or maybe is that person — who shuts their eyes tight during the scary parts of a horror film and forces their friend to go first in the haunted house.

Others avoid scary movies and haunted houses altogether during Halloween. In a study published in August, a team at the University of Colorado Boulder studied how people’s brains respond to threats and fear.

The researchers found that a group of neurons, called the interpeduncular nucleus or IPN, plays a role in controlling how people respond and adapt to threats. IPN is a brain circuit located in the midbrain near the brain stem. The team discovered that this circuitry is highly activated the first time a person sees a potentially threatening situation, but as soon as individuals realize there is no threat anymore