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.

Brain cells in the interpeduncular nucleus glow green in a mouse’s brain after a shadow appears on the ceiling. (Photo courtesy of CU Boulder)

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 circuitr