Stress Can Confuse Your Brain's Navigation System

Topic: Health

Researchers from Germany found that stress hormone cortisol can affect how our brains navigate and stay oriented. They used MRI scans to study brain activity in 40 participants who completed a virtual navigation task while receiving either cortisol or a placebo. The results showed that cortisol made it harder for participants to find their way, especially when there were no permanent landmarks.

Researchers from Ruhr University Bochum in Germany wanted to understand how stress affects our brain's ability to navigate. They used MRI scans to study brain activity in 40 healthy men who completed a virtual navigation task. The participants received either 20 milligrams of cortisol or a placebo on two separate days.

The researchers found that cortisol made it harder for the participants to find their way, especially when there were no permanent landmarks. In fact, the participants who received cortisol made larger errors than those who received the placebo. This was true even when they had access to a lighthouse as a fixed reference point.

The MRI scans also showed that cortisol affected the activity of grid cells in the entorhinal cortex, which is an important part of our brain's navigation system. Grid cells are like a map that helps us navigate and stay oriented. When participants received cortisol, their grid cell activity became less distinct and less precise.

The researchers think that this could be because the brain tries to compensate for the loss of its main navigation system by using alternative strategies. They also found that cortisol increased activity in another part of the brain called the caudate nucleus.

Why It Matters

This study is important because it shows how stress can affect our brain's ability to navigate and stay oriented. This could be especially relevant for people who experience chronic stress, such as those with Alzheimer's disease. Understanding how cortisol affects our brain's navigation system could help us develop new treatments for neurological diseases.

Key Facts

• 40 healthy men participated in the study from Ruhr University Bochum in Germany.
• The participants received either 20 milligrams of cortisol or a placebo on two separate days.
• Cortisol made it harder for participants to find their way, especially when there were no permanent landmarks.
• Grid cells in the entorhinal cortex are affected by cortisol and play an important role in our brain's navigation system.
• The study was published in PLOS Biology on March 12, 2026.

Key Terms

Cortisol

A hormone released by the body in response to stress

Entorhinal cortex

A part of the brain that helps us navigate and stay oriented

Grid cells

Specialized nerve cells that help us navigate and stay oriented

Implications

This study is important because it shows how stress can affect our brain's ability to navigate and stay oriented. This could be especially relevant for people who experience chronic stress, such as those with Alzheimer's disease. Understanding how cortisol affects our brain's navigation system could help us develop new treatments for neurological diseases.